90518515 has 4 divisors (see below), whose sum is σ = 108622224. Its totient is φ = 72414808.

The previous prime is 90518513. The next prime is 90518531. The reversal of 90518515 is 51581509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51581509 = 7 ⋅7368787.

It is a cyclic number.

It is not a de Polignac number, because 90518515 - 2¹ = 90518513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90518513) 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, 9051847 + ... + 9051856.

It is an arithmetic number, because the mean of its divisors is an integer number (27155556).

Almost surely, 2^90518515 is an apocalyptic number.

90518515 is a deficient number, since it is larger than the sum of its proper divisors (18103709).

90518515 is a wasteful number, since it uses less digits than its factorization.

90518515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18103708.

The product of its (nonzero) digits is 9000, while the sum is 34.

The square root of 90518515 is about 9514.1218722486. The cubic root of 90518515 is about 448.9994477534. Note that the first 3 decimals are identical.

The spelling of 90518515 in words is "ninety million, five hundred eighteen thousand, five hundred fifteen".