145131831 has 20 divisors (see below), whose sum is σ = 233480632. Its totient is φ = 89311248.

The previous prime is 145131809. The next prime is 145131869. The reversal of 145131831 is 138131541.

It is not a de Polignac number, because 145131831 - 2⁹ = 145131319 is a prime.

It is a super-2 number, since 2×145131831² = 42126496738825122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145131795 and 145131804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145131031) 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 in 19 ways as a sum of consecutive naturals, for example, 67861 + ... + 69966.

Almost surely, 2^145131831 is an apocalyptic number.

145131831 is a deficient number, since it is larger than the sum of its proper divisors (88348801).

145131831 is a wasteful number, since it uses less digits than its factorization.

145131831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137852 (or 137843 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 145131831 is about 12047.0673194766. The cubic root of 145131831 is about 525.5179541352.

The spelling of 145131831 in words is "one hundred forty-five million, one hundred thirty-one thousand, eight hundred thirty-one".