61943997 has 4 divisors (see below), whose sum is σ = 82592000. Its totient is φ = 41295996.

The previous prime is 61943993. The next prime is 61944017. The reversal of 61943997 is 79934916.

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 61943997 - 2² = 61943993 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 (61943993) 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, 10323997 + ... + 10324002.

It is an arithmetic number, because the mean of its divisors is an integer number (20648000).

Almost surely, 2^61943997 is an apocalyptic number.

It is an amenable number.

61943997 is a deficient number, since it is larger than the sum of its proper divisors (20648003).

61943997 is a wasteful number, since it uses less digits than its factorization.

61943997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20648002.

The product of its digits is 367416, while the sum is 48.

The square root of 61943997 is about 7870.4508765381. The cubic root of 61943997 is about 395.6699563576.

The spelling of 61943997 in words is "sixty-one million, nine hundred forty-three thousand, nine hundred ninety-seven".