61358391 has 20 divisors (see below), whose sum is σ = 96485400. Its totient is φ = 38751696.

The previous prime is 61358383. The next prime is 61358419. The reversal of 61358391 is 19385316.

It is a happy number.

61358391 is a `hidden beast` number, since 613 + 5 + 8 + 39 + 1 = 666.

It is not a de Polignac number, because 61358391 - 2³ = 61358383 is a prime.

It is a super-2 number, since 2×61358391² = 7529704292217762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61358351) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18396 + ... + 21473.

It is an arithmetic number, because the mean of its divisors is an integer number (4824270).

Almost surely, 2^61358391 is an apocalyptic number.

61358391 is a deficient number, since it is larger than the sum of its proper divisors (35127009).

61358391 is a wasteful number, since it uses less digits than its factorization.

61358391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39900 (or 39891 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 61358391 is about 7833.1597072956. The cubic root of 61358391 is about 394.4191451927.

The spelling of 61358391 in words is "sixty-one million, three hundred fifty-eight thousand, three hundred ninety-one".