61906831 has 8 divisors (see below), whose sum is σ = 70922880. Its totient is φ = 52933848.

The previous prime is 61906813. The next prime is 61906837. The reversal of 61906831 is 13860916.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61906831 - 2¹¹ = 61904783 is a prime.

It is a super-2 number, since 2×61906831² = 7664911448925122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61906837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7621 + ... + 13486.

It is an arithmetic number, because the mean of its divisors is an integer number (8865360).

Almost surely, 2^61906831 is an apocalyptic number.

61906831 is a deficient number, since it is larger than the sum of its proper divisors (9016049).

61906831 is a wasteful number, since it uses less digits than its factorization.

61906831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21533.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 61906831 is about 7868.0894123033. The cubic root of 61906831 is about 395.5908073825.

The spelling of 61906831 in words is "sixty-one million, nine hundred six thousand, eight hundred thirty-one".