61996591 has 4 divisors (see below), whose sum is σ = 63166392. Its totient is φ = 60826792.

The previous prime is 61996541. The next prime is 61996609. The reversal of 61996591 is 19569916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61996591 - 2⁷ = 61996463 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 (61996511) 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, 584821 + ... + 584926.

It is an arithmetic number, because the mean of its divisors is an integer number (15791598).

Almost surely, 2^61996591 is an apocalyptic number.

61996591 is a deficient number, since it is larger than the sum of its proper divisors (1169801).

61996591 is a wasteful number, since it uses less digits than its factorization.

61996591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169800.

The product of its digits is 131220, while the sum is 46.

The square root of 61996591 is about 7873.7913993196. The cubic root of 61996591 is about 395.7819068284.

The spelling of 61996591 in words is "sixty-one million, nine hundred ninety-six thousand, five hundred ninety-one".