145812515 has 4 divisors (see below), whose sum is σ = 174975024. Its totient is φ = 116650008.

The previous prime is 145812503. The next prime is 145812521. The reversal of 145812515 is 515218541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515218541 = 17 ⋅30306973.

It is a cyclic number.

It is not a de Polignac number, because 145812515 - 2¹² = 145808419 is a prime.

It is a super-2 number, since 2×145812515² = 42522579061250450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14581247 + ... + 14581256.

It is an arithmetic number, because the mean of its divisors is an integer number (43743756).

Almost surely, 2^145812515 is an apocalyptic number.

145812515 is a deficient number, since it is larger than the sum of its proper divisors (29162509).

145812515 is an equidigital number, since it uses as much as digits as its factorization.

145812515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29162508.

The product of its digits is 8000, while the sum is 32.

The square root of 145812515 is about 12075.2852968367. The cubic root of 145812515 is about 526.3382517405.

The spelling of 145812515 in words is "one hundred forty-five million, eight hundred twelve thousand, five hundred fifteen".