61771541 has 4 divisors (see below), whose sum is σ = 66523212. Its totient is φ = 57019872.

The previous prime is 61771531. The next prime is 61771547. The reversal of 61771541 is 14517716.

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 37466641 + 24304900 = 6121^2 + 4930^2 .

It is a de Polignac number, because none of the positive numbers 2^k-61771541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61771498 and 61771507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2375816 + ... + 2375841.

It is an arithmetic number, because the mean of its divisors is an integer number (16630803).

Almost surely, 2^61771541 is an apocalyptic number.

It is an amenable number.

61771541 is a deficient number, since it is larger than the sum of its proper divisors (4751671).

61771541 is a wasteful number, since it uses less digits than its factorization.

61771541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4751670.

The product of its digits is 5880, while the sum is 32.

The square root of 61771541 is about 7859.4873242470. The cubic root of 61771541 is about 395.3024250199.

The spelling of 61771541 in words is "sixty-one million, seven hundred seventy-one thousand, five hundred forty-one".