913221451 has 2 divisors, whose sum is σ = 913221452. Its totient is φ = 913221450.

The previous prime is 913221443. The next prime is 913221499. The reversal of 913221451 is 154122319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 913221451 - 2³ = 913221443 is a prime.

It is not a weakly prime, because it can be changed into another prime (913221251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 456610725 + 456610726.

It is an arithmetic number, because the mean of its divisors is an integer number (456610726).

Almost surely, 2^913221451 is an apocalyptic number.

913221451 is a deficient number, since it is larger than the sum of its proper divisors (1).

913221451 is an equidigital number, since it uses as much as digits as its factorization.

913221451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 913221451 is about 30219.5541164988. The cubic root of 913221451 is about 970.1942612310.

The spelling of 913221451 in words is "nine hundred thirteen million, two hundred twenty-one thousand, four hundred fifty-one".