76972921 has 2 divisors, whose sum is σ = 76972922. Its totient is φ = 76972920.

The previous prime is 76972919. The next prime is 76972963. The reversal of 76972921 is 12927967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75012921 + 1960000 = 8661^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 76972921 - 2¹ = 76972919 is a prime.

Together with 76972919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (76972121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38486460 + 38486461.

It is an arithmetic number, because the mean of its divisors is an integer number (38486461).

Almost surely, 2^76972921 is an apocalyptic number.

It is an amenable number.

76972921 is a deficient number, since it is larger than the sum of its proper divisors (1).

76972921 is an equidigital number, since it uses as much as digits as its factorization.

76972921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 76972921 is about 8773.4212824872. The cubic root of 76972921 is about 425.3822093418.

The spelling of 76972921 in words is "seventy-six million, nine hundred seventy-two thousand, nine hundred twenty-one".