151431021 has 18 divisors (see below), whose sum is σ = 254446062. Its totient is φ = 86531760.

The previous prime is 151431013. The next prime is 151431041. The reversal of 151431021 is 120134151.

151431021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 150921225 + 509796 = 12285^2 + 714^2 .

It is not a de Polignac number, because 151431021 - 2³ = 151431013 is a prime.

It is a super-2 number, since 2×151431021² = 45862708242204882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 151430985 and 151431003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151431041) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 171250 + ... + 172131.

Almost surely, 2^151431021 is an apocalyptic number.

It is an amenable number.

151431021 is a deficient number, since it is larger than the sum of its proper divisors (103015041).

151431021 is a wasteful number, since it uses less digits than its factorization.

151431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343401 (or 343391 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 151431021 is about 12305.7312257338. The cubic root of 151431021 is about 533.0135916381.

Adding to 151431021 its reverse (120134151), we get a palindrome (271565172).

The spelling of 151431021 in words is "one hundred fifty-one million, four hundred thirty-one thousand, twenty-one".