61812061 has 4 divisors (see below), whose sum is σ = 61835452. Its totient is φ = 61788672.

The previous prime is 61812059. The next prime is 61812067. The reversal of 61812061 is 16021816.

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 38675961 + 23136100 = 6219^2 + 4810^2 .

It is a cyclic number.

It is not a de Polignac number, because 61812061 - 2¹ = 61812059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61812067) 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, 7140 + ... + 13213.

It is an arithmetic number, because the mean of its divisors is an integer number (15458863).

Almost surely, 2^61812061 is an apocalyptic number.

It is an amenable number.

61812061 is a deficient number, since it is larger than the sum of its proper divisors (23391).

61812061 is a wasteful number, since it uses less digits than its factorization.

61812061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23390.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 61812061 is about 7862.0646779329. The cubic root of 61812061 is about 395.3888410454.

Adding to 61812061 its reverse (16021816), we get a palindrome (77833877).

The spelling of 61812061 in words is "sixty-one million, eight hundred twelve thousand, sixty-one".