61309131 has 8 divisors (see below), whose sum is σ = 88033680. Its totient is φ = 37728672.

The previous prime is 61309117. The next prime is 61309133. The reversal of 61309131 is 13190316.

61309131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61309131 - 2⁹ = 61308619 is a prime.

It is a super-2 number, since 2×61309131² = 7517619087950322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61309133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 785976 + ... + 786053.

It is an arithmetic number, because the mean of its divisors is an integer number (11004210).

Almost surely, 2^61309131 is an apocalyptic number.

61309131 is a deficient number, since it is larger than the sum of its proper divisors (26724549).

61309131 is a wasteful number, since it uses less digits than its factorization.

61309131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572045.

The product of its (nonzero) digits is 486, while the sum is 24.

The square root of 61309131 is about 7830.0147509440. The cubic root of 61309131 is about 394.3135671918.

Adding to 61309131 its reverse (13190316), we get a palindrome (74499447).

The spelling of 61309131 in words is "sixty-one million, three hundred nine thousand, one hundred thirty-one".