901319921 has 2 divisors, whose sum is σ = 901319922. Its totient is φ = 901319920.

The previous prime is 901319917. The next prime is 901319941. The reversal of 901319921 is 129913109.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 790228321 + 111091600 = 28111^2 + 10540^2 .

It is a cyclic number.

It is not a de Polignac number, because 901319921 - 2² = 901319917 is a prime.

It is equal to p_46073429 and since 901319921 and 46073429 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (901319911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450659960 + 450659961.

It is an arithmetic number, because the mean of its divisors is an integer number (450659961).

Almost surely, 2^901319921 is an apocalyptic number.

It is an amenable number.

901319921 is a deficient number, since it is larger than the sum of its proper divisors (1).

901319921 is an equidigital number, since it uses as much as digits as its factorization.

901319921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 901319921 is about 30021.9906235413. The cubic root of 901319921 is about 965.9611428402.

The spelling of 901319921 in words is "nine hundred one million, three hundred nineteen thousand, nine hundred twenty-one".