80900921 has 2 divisors, whose sum is σ = 80900922. Its totient is φ = 80900920.

The previous prime is 80900903. The next prime is 80900929. The reversal of 80900921 is 12900908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53860921 + 27040000 = 7339^2 + 5200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80900921 is a prime.

It is not a weakly prime, because it can be changed into another prime (80900929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40450460 + 40450461.

It is an arithmetic number, because the mean of its divisors is an integer number (40450461).

Almost surely, 2^80900921 is an apocalyptic number.

It is an amenable number.

80900921 is a deficient number, since it is larger than the sum of its proper divisors (1).

80900921 is an equidigital number, since it uses as much as digits as its factorization.

80900921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 80900921 is about 8994.4939268421. The cubic root of 80900921 is about 432.4983835016.

The spelling of 80900921 in words is "eighty million, nine hundred thousand, nine hundred twenty-one".