90918151 has 4 divisors (see below), whose sum is σ = 91004904. Its totient is φ = 90831400.

The previous prime is 90918143. The next prime is 90918181. The reversal of 90918151 is 15181909.

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

It is a cyclic number.

It is not a de Polignac number, because 90918151 - 2³ = 90918143 is a prime.

It is a super-2 number, since 2×90918151² = 16532220362517602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90918181) 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, 41785 + ... + 43906.

It is an arithmetic number, because the mean of its divisors is an integer number (22751226).

Almost surely, 2^90918151 is an apocalyptic number.

90918151 is a deficient number, since it is larger than the sum of its proper divisors (86753).

90918151 is a wasteful number, since it uses less digits than its factorization.

90918151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86752.

The product of its (nonzero) digits is 3240, while the sum is 34.

The square root of 90918151 is about 9535.1009957944. The cubic root of 90918151 is about 449.6592498604.

The spelling of 90918151 in words is "ninety million, nine hundred eighteen thousand, one hundred fifty-one".