145431322531 has 16 divisors (see below), whose sum is σ = 160254581760. Its totient is φ = 130881733920.

The previous prime is 145431322523. The next prime is 145431322591. The reversal of 145431322531 is 135223134541.

It is a cyclic number.

It is not a de Polignac number, because 145431322531 - 2³ = 145431322523 is a prime.

It is a super-2 number, since 2×145431322531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145431322591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 273481 + ... + 604693.

It is an arithmetic number, because the mean of its divisors is an integer number (10015911360).

Almost surely, 2^145431322531 is an apocalyptic number.

145431322531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145431322531 is a deficient number, since it is larger than the sum of its proper divisors (14823259229).

145431322531 is a wasteful number, since it uses less digits than its factorization.

145431322531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331626.

The product of its digits is 43200, while the sum is 34.

The spelling of 145431322531 in words is "one hundred forty-five billion, four hundred thirty-one million, three hundred twenty-two thousand, five hundred thirty-one".