61959591 has 12 divisors (see below), whose sum is σ = 90965160. Its totient is φ = 40628880.

The previous prime is 61959587. The next prime is 61959613. The reversal of 61959591 is 19595916.

It is a happy number.

61959591 is a `hidden beast` number, since 6 + 1 + 9 + 59 + 591 = 666.

It is not a de Polignac number, because 61959591 - 2² = 61959587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61959511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55881 + ... + 56978.

It is an arithmetic number, because the mean of its divisors is an integer number (7580430).

Almost surely, 2^61959591 is an apocalyptic number.

61959591 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

61959591 is a deficient number, since it is larger than the sum of its proper divisors (29005569).

61959591 is a wasteful number, since it uses less digits than its factorization.

61959591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112926 (or 112923 counting only the distinct ones).

The product of its digits is 109350, while the sum is 45.

The square root of 61959591 is about 7871.4414817110. The cubic root of 61959591 is about 395.7031560214.

The spelling of 61959591 in words is "sixty-one million, nine hundred fifty-nine thousand, five hundred ninety-one".