76156921 has 6 divisors (see below), whose sum is σ = 80376522. Its totient is φ = 72148320.

The previous prime is 76156909. The next prime is 76156973. The reversal of 76156921 is 12965167.

It can be written as a sum of positive squares in only one way, i.e., 75064896 + 1092025 = 8664^2 + 1045^2 .

It is not a de Polignac number, because 76156921 - 2¹⁹ = 75632633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76156621) 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, 105120 + ... + 105841.

It is an arithmetic number, because the mean of its divisors is an integer number (13396087).

Almost surely, 2^76156921 is an apocalyptic number.

It is an amenable number.

76156921 is a deficient number, since it is larger than the sum of its proper divisors (4219601).

76156921 is a wasteful number, since it uses less digits than its factorization.

76156921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210999 (or 210980 counting only the distinct ones).

The product of its digits is 22680, while the sum is 37.

The square root of 76156921 is about 8726.7932827586. The cubic root of 76156921 is about 423.8736885676.

It can be divided in two parts, 76156 and 921, that added together give a palindrome (77077).

The spelling of 76156921 in words is "seventy-six million, one hundred fifty-six thousand, nine hundred twenty-one".