75131515 has 4 divisors (see below), whose sum is σ = 90157824. Its totient is φ = 60105208.

The previous prime is 75131503. The next prime is 75131519. The reversal of 75131515 is 51513157.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51513157 = 179 ⋅287783.

It is a cyclic number.

It is not a de Polignac number, because 75131515 - 2⁹ = 75131003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75131519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7513147 + ... + 7513156.

It is an arithmetic number, because the mean of its divisors is an integer number (22539456).

Almost surely, 2^75131515 is an apocalyptic number.

75131515 is a deficient number, since it is larger than the sum of its proper divisors (15026309).

75131515 is a wasteful number, since it uses less digits than its factorization.

75131515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15026308.

The product of its digits is 2625, while the sum is 28.

The square root of 75131515 is about 8667.8437341706. The cubic root of 75131515 is about 421.9626865925.

The spelling of 75131515 in words is "seventy-five million, one hundred thirty-one thousand, five hundred fifteen".