61818831 has 6 divisors (see below), whose sum is σ = 89293880. Its totient is φ = 41212548.

The previous prime is 61818811. The next prime is 61818833. The reversal of 61818831 is 13881816.

61818831 is a `hidden beast` number, since 618 + 1 + 8 + 8 + 31 = 666.

It is not a de Polignac number, because 61818831 - 2¹⁰ = 61817807 is a prime.

It is a super-2 number, since 2×61818831² = 7643135732413122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61818833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3434371 + ... + 3434388.

Almost surely, 2^61818831 is an apocalyptic number.

61818831 is a deficient number, since it is larger than the sum of its proper divisors (27475049).

61818831 is a wasteful number, since it uses less digits than its factorization.

61818831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6868765 (or 6868762 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 61818831 is about 7862.4952146249. The cubic root of 61818831 is about 395.4032755786.

The spelling of 61818831 in words is "sixty-one million, eight hundred eighteen thousand, eight hundred thirty-one".