61697613 has 4 divisors (see below), whose sum is σ = 82263488. Its totient is φ = 41131740.

The previous prime is 61697609. The next prime is 61697653. The reversal of 61697613 is 31679616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61697613 - 2² = 61697609 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61697653) 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, 10282933 + ... + 10282938.

It is an arithmetic number, because the mean of its divisors is an integer number (20565872).

Almost surely, 2^61697613 is an apocalyptic number.

It is an amenable number.

61697613 is a deficient number, since it is larger than the sum of its proper divisors (20565875).

61697613 is a wasteful number, since it uses less digits than its factorization.

61697613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20565874.

The product of its digits is 40824, while the sum is 39.

The square root of 61697613 is about 7854.7828104920. The cubic root of 61697613 is about 395.1446631373.

The spelling of 61697613 in words is "sixty-one million, six hundred ninety-seven thousand, six hundred thirteen".