61537117 has 4 divisors (see below), whose sum is σ = 61630876. Its totient is φ = 61443360.

The previous prime is 61537111. The next prime is 61537141. The reversal of 61537117 is 71173516.

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 34351321 + 27185796 = 5861^2 + 5214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61537117 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 (61537111) 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, 45888 + ... + 47209.

It is an arithmetic number, because the mean of its divisors is an integer number (15407719).

Almost surely, 2^61537117 is an apocalyptic number.

It is an amenable number.

61537117 is a deficient number, since it is larger than the sum of its proper divisors (93759).

61537117 is an equidigital number, since it uses as much as digits as its factorization.

61537117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93758.

The product of its digits is 4410, while the sum is 31.

The square root of 61537117 is about 7844.5597072111. The cubic root of 61537117 is about 394.8017313997.

The spelling of 61537117 in words is "sixty-one million, five hundred thirty-seven thousand, one hundred seventeen".