77167921 has 4 divisors (see below), whose sum is σ = 80523072. Its totient is φ = 73812772.

The previous prime is 77167901. The next prime is 77167943. The reversal of 77167921 is 12976177.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12976177 = 101 ⋅128477.

It is a cyclic number.

It is not a de Polignac number, because 77167921 - 2⁵ = 77167889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77167901) 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, 1677541 + ... + 1677586.

It is an arithmetic number, because the mean of its divisors is an integer number (20130768).

Almost surely, 2^77167921 is an apocalyptic number.

It is an amenable number.

77167921 is a deficient number, since it is larger than the sum of its proper divisors (3355151).

77167921 is a wasteful number, since it uses less digits than its factorization.

77167921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3355150.

The product of its digits is 37044, while the sum is 40.

The square root of 77167921 is about 8784.5273634954. The cubic root of 77167921 is about 425.7411216329.

The spelling of 77167921 in words is "seventy-seven million, one hundred sixty-seven thousand, nine hundred twenty-one".