76912921 has 2 divisors, whose sum is σ = 76912922. Its totient is φ = 76912920.

The previous prime is 76912919. The next prime is 76912933. The reversal of 76912921 is 12921967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55651600 + 21261321 = 7460^2 + 4611^2 .

It is an emirp because it is prime and its reverse (12921967) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76912921 - 2¹ = 76912919 is a prime.

Together with 76912919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (76912961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38456460 + 38456461.

It is an arithmetic number, because the mean of its divisors is an integer number (38456461).

Almost surely, 2^76912921 is an apocalyptic number.

It is an amenable number.

76912921 is a deficient number, since it is larger than the sum of its proper divisors (1).

76912921 is an equidigital number, since it uses as much as digits as its factorization.

76912921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 76912921 is about 8770.0011972633. The cubic root of 76912921 is about 425.2716528553.

The spelling of 76912921 in words is "seventy-six million, nine hundred twelve thousand, nine hundred twenty-one".