445531997 has 2 divisors, whose sum is σ = 445531998. Its totient is φ = 445531996.

The previous prime is 445531979. The next prime is 445532023. The reversal of 445531997 is 799135544.

Together with previous prime (445531979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384395236 + 61136761 = 19606^2 + 7819^2 .

It is a cyclic number.

It is not a de Polignac number, because 445531997 - 2²⁰ = 444483421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445531967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222765998 + 222765999.

It is an arithmetic number, because the mean of its divisors is an integer number (222765999).

Almost surely, 2^445531997 is an apocalyptic number.

It is an amenable number.

445531997 is a deficient number, since it is larger than the sum of its proper divisors (1).

445531997 is an equidigital number, since it uses as much as digits as its factorization.

445531997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 47.

The square root of 445531997 is about 21107.6288815205. The cubic root of 445531997 is about 763.7647897826.

The spelling of 445531997 in words is "four hundred forty-five million, five hundred thirty-one thousand, nine hundred ninety-seven".