61771613 has 4 divisors (see below), whose sum is σ = 61793628. Its totient is φ = 61749600.

The previous prime is 61771597. The next prime is 61771627. The reversal of 61771613 is 31617716.

61771613 = 5557² + 5558².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30880249 + 30891364 = 5557^2 + 5558^2 .

It is a cyclic number.

It is not a de Polignac number, because 61771613 - 2⁴ = 61771597 is a prime.

It is a super-3 number, since 3×61771613³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61771613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6056 + ... + 12657.

It is an arithmetic number, because the mean of its divisors is an integer number (15448407).

Almost surely, 2^61771613 is an apocalyptic number.

61771613 is the 5558-th centered square number.

It is an amenable number.

61771613 is a deficient number, since it is larger than the sum of its proper divisors (22015).

61771613 is a wasteful number, since it uses less digits than its factorization.

61771613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22014.

The product of its digits is 5292, while the sum is 32.

The square root of 61771613 is about 7859.4919046971. The cubic root of 61771613 is about 395.3025786061.

It can be divided in two parts, 617716 and 13, that multiplied together give a palindrome (8030308).

The spelling of 61771613 in words is "sixty-one million, seven hundred seventy-one thousand, six hundred thirteen".