431500081 has 2 divisors, whose sum is σ = 431500082. Its totient is φ = 431500080.

The previous prime is 431500057. The next prime is 431500087. The reversal of 431500081 is 180005134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427662400 + 3837681 = 20680^2 + 1959^2 .

It is a cyclic number.

It is not a de Polignac number, because 431500081 - 2⁵ = 431500049 is a prime.

It is a super-2 number, since 2×431500081² = 372384639806013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (431500087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215750040 + 215750041.

It is an arithmetic number, because the mean of its divisors is an integer number (215750041).

Almost surely, 2^431500081 is an apocalyptic number.

It is an amenable number.

431500081 is a deficient number, since it is larger than the sum of its proper divisors (1).

431500081 is an equidigital number, since it uses as much as digits as its factorization.

431500081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 431500081 is about 20772.5800275267. The cubic root of 431500081 is about 755.6609162382.

The spelling of 431500081 in words is "four hundred thirty-one million, five hundred thousand, eighty-one".