451331381 has 2 divisors, whose sum is σ = 451331382. Its totient is φ = 451331380.

The previous prime is 451331347. The next prime is 451331389. The reversal of 451331381 is 183133154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399000625 + 52330756 = 19975^2 + 7234^2 .

It is a cyclic number.

It is not a de Polignac number, because 451331381 - 2¹⁸ = 451069237 is a prime.

It is a super-2 number, since 2×451331381² = 407400030950734322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (451331389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225665690 + 225665691.

It is an arithmetic number, because the mean of its divisors is an integer number (225665691).

Almost surely, 2^451331381 is an apocalyptic number.

It is an amenable number.

451331381 is a deficient number, since it is larger than the sum of its proper divisors (1).

451331381 is an equidigital number, since it uses as much as digits as its factorization.

451331381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 451331381 is about 21244.5612098720. The cubic root of 451331381 is about 767.0644289049.

The spelling of 451331381 in words is "four hundred fifty-one million, three hundred thirty-one thousand, three hundred eighty-one".