145231515 has 64 divisors (see below), whose sum is σ = 303367680. Its totient is φ = 64990080.

The previous prime is 145231487. The next prime is 145231531. The reversal of 145231515 is 515132541.

145231515 is a `hidden beast` number, since 145 + 2 + 3 + 1 + 515 = 666.

It is not a de Polignac number, because 145231515 - 2⁶ = 145231451 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15544 + ... + 23066.

It is an arithmetic number, because the mean of its divisors is an integer number (4740120).

Almost surely, 2^145231515 is an apocalyptic number.

145231515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

145231515 is an abundant number, since it is smaller than the sum of its proper divisors (158136165).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145231515 is a wasteful number, since it uses less digits than its factorization.

145231515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7561 (or 7555 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 145231515 is about 12051.2038817705. The cubic root of 145231515 is about 525.6382441782.

The spelling of 145231515 in words is "one hundred forty-five million, two hundred thirty-one thousand, five hundred fifteen".