151431621 has 24 divisors (see below), whose sum is σ = 229108992. Its totient is φ = 88809600.

The previous prime is 151431617. The next prime is 151431719. The reversal of 151431621 is 126134151.

It is a happy number.

It is not a de Polignac number, because 151431621 - 2² = 151431617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 151431591 and 151431600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151431601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4525 + ... + 17981.

It is an arithmetic number, because the mean of its divisors is an integer number (9546208).

Almost surely, 2^151431621 is an apocalyptic number.

151431621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

151431621 is a deficient number, since it is larger than the sum of its proper divisors (77677371).

151431621 is a wasteful number, since it uses less digits than its factorization.

151431621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13513 (or 13502 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 151431621 is about 12305.7556045941. The cubic root of 151431621 is about 533.0142956060.

Adding to 151431621 its reverse (126134151), we get a palindrome (277565772).

The spelling of 151431621 in words is "one hundred fifty-one million, four hundred thirty-one thousand, six hundred twenty-one".