139571431 has 2 divisors, whose sum is σ = 139571432. Its totient is φ = 139571430.

The previous prime is 139571417. The next prime is 139571533. The reversal of 139571431 is 134175931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139571431 - 2¹⁷ = 139440359 is a prime.

It is a super-2 number, since 2×139571431² = 38960368702775522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139371431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69785715 + 69785716.

It is an arithmetic number, because the mean of its divisors is an integer number (69785716).

Almost surely, 2^139571431 is an apocalyptic number.

139571431 is a deficient number, since it is larger than the sum of its proper divisors (1).

139571431 is an equidigital number, since it uses as much as digits as its factorization.

139571431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 139571431 is about 11814.0353393749. The cubic root of 139571431 is about 518.7190252759.

The spelling of 139571431 in words is "one hundred thirty-nine million, five hundred seventy-one thousand, four hundred thirty-one".