90531515 has 4 divisors (see below), whose sum is σ = 108637824. Its totient is φ = 72425208.

The previous prime is 90531509. The next prime is 90531521. The reversal of 90531515 is 51513509.

It is a happy number.

90531515 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (90531509) and next prime (90531521).

It is a cyclic number.

It is not a de Polignac number, because 90531515 - 2¹⁶ = 90465979 is a prime.

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, 9053147 + ... + 9053156.

It is an arithmetic number, because the mean of its divisors is an integer number (27159456).

Almost surely, 2^90531515 is an apocalyptic number.

90531515 is a deficient number, since it is larger than the sum of its proper divisors (18106309).

90531515 is a wasteful number, since it uses less digits than its factorization.

90531515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18106308.

The product of its (nonzero) digits is 3375, while the sum is 29.

The square root of 90531515 is about 9514.8050426690. The cubic root of 90531515 is about 449.0209413797.

The spelling of 90531515 in words is "ninety million, five hundred thirty-one thousand, five hundred fifteen".