77242131 has 12 divisors (see below), whose sum is σ = 111663552. Its totient is φ = 51452496.

The previous prime is 77242129. The next prime is 77242141. The reversal of 77242131 is 13124277.

It is a happy number.

It is not a de Polignac number, because 77242131 - 2¹ = 77242129 is a prime.

It is a super-2 number, since 2×77242131² = 11932693602842322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77242095 and 77242104.

It is not an unprimeable number, because it can be changed into a prime (77242141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11365 + ... + 16841.

It is an arithmetic number, because the mean of its divisors is an integer number (9305296).

Almost surely, 2^77242131 is an apocalyptic number.

77242131 is a deficient number, since it is larger than the sum of its proper divisors (34421421).

77242131 is a wasteful number, since it uses less digits than its factorization.

77242131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050 (or 7047 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 77242131 is about 8788.7502524534. The cubic root of 77242131 is about 425.8775519262.

The spelling of 77242131 in words is "seventy-seven million, two hundred forty-two thousand, one hundred thirty-one".