61321131 has 20 divisors (see below), whose sum is σ = 94561984. Its totient is φ = 39560400.

The previous prime is 61321129. The next prime is 61321163. The reversal of 61321131 is 13112316.

61321131 is a `hidden beast` number, since 613 + 21 + 1 + 31 = 666.

It is not a de Polignac number, because 61321131 - 2¹ = 61321129 is a prime.

It is a super-2 number, since 2×61321131² = 7520562214238322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61321121) 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, 9700 + ... + 14721.

Almost surely, 2^61321131 is an apocalyptic number.

61321131 is a deficient number, since it is larger than the sum of its proper divisors (33240853).

61321131 is a wasteful number, since it uses less digits than its factorization.

61321131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24464 (or 24455 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 61321131 is about 7830.7809955329. The cubic root of 61321131 is about 394.3392917674.

Adding to 61321131 its reverse (13112316), we get a palindrome (74433447).

The spelling of 61321131 in words is "sixty-one million, three hundred twenty-one thousand, one hundred thirty-one".