145131531 has 8 divisors (see below), whose sum is σ = 193567440. Its totient is φ = 96724992.

The previous prime is 145131529. The next prime is 145131551. The reversal of 145131531 is 135131541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 145131531 - 2¹ = 145131529 is a prime.

It is a super-2 number, since 2×145131531² = 42126322580807922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145131551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10135 + ... + 19823.

It is an arithmetic number, because the mean of its divisors is an integer number (24195930).

Almost surely, 2^145131531 is an apocalyptic number.

145131531 is a deficient number, since it is larger than the sum of its proper divisors (48435909).

145131531 is an equidigital number, since it uses as much as digits as its factorization.

145131531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14685.

The product of its digits is 900, while the sum is 24.

The square root of 145131531 is about 12047.0548683070. The cubic root of 145131531 is about 525.5175920380.

The spelling of 145131531 in words is "one hundred forty-five million, one hundred thirty-one thousand, five hundred thirty-one".