77130831 has 4 divisors (see below), whose sum is σ = 102841112. Its totient is φ = 51420552.

The previous prime is 77130817. The next prime is 77130913. The reversal of 77130831 is 13803177.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 77130831 - 2¹⁴ = 77114447 is a prime.

It is a super-2 number, since 2×77130831² = 11898330181501122, 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 (77130331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12855136 + ... + 12855141.

It is an arithmetic number, because the mean of its divisors is an integer number (25710278).

Almost surely, 2^77130831 is an apocalyptic number.

77130831 is a deficient number, since it is larger than the sum of its proper divisors (25710281).

77130831 is a wasteful number, since it uses less digits than its factorization.

77130831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710280.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 77130831 is about 8782.4160115540. The cubic root of 77130831 is about 425.6729012784.

The spelling of 77130831 in words is "seventy-seven million, one hundred thirty thousand, eight hundred thirty-one".