151431397 has 6 divisors (see below), whose sum is σ = 163127762. Its totient is φ = 139741872.

The previous prime is 151431389. The next prime is 151431403. The reversal of 151431397 is 793134151.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 69239041 + 82192356 = 8321^2 + 9066^2 .

It is not a de Polignac number, because 151431397 - 2³ = 151431389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151431307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42663 + ... + 46075.

Almost surely, 2^151431397 is an apocalyptic number.

It is an amenable number.

151431397 is a deficient number, since it is larger than the sum of its proper divisors (11696365).

151431397 is an frugal number, since it uses more digits than its factorization.

151431397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839 (or 3426 counting only the distinct ones).

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

The square root of 151431397 is about 12305.7465031586. The cubic root of 151431397 is about 533.0140327915.

The spelling of 151431397 in words is "one hundred fifty-one million, four hundred thirty-one thousand, three hundred ninety-seven".