61997937 has 4 divisors (see below), whose sum is σ = 82663920. Its totient is φ = 41331956.

The previous prime is 61997927. The next prime is 61997953. The reversal of 61997937 is 73979916.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61997937 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61997937.

It is not an unprimeable number, because it can be changed into a prime (61997917) 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, 10332987 + ... + 10332992.

It is an arithmetic number, because the mean of its divisors is an integer number (20665980).

Almost surely, 2^61997937 is an apocalyptic number.

It is an amenable number.

61997937 is a deficient number, since it is larger than the sum of its proper divisors (20665983).

61997937 is a wasteful number, since it uses less digits than its factorization.

61997937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20665982.

The product of its digits is 642978, while the sum is 51.

The square root of 61997937 is about 7873.8768722911. The cubic root of 61997937 is about 395.7847710643.

The spelling of 61997937 in words is "sixty-one million, nine hundred ninety-seven thousand, nine hundred thirty-seven".