90511561 has 8 divisors (see below), whose sum is σ = 103825664. Its totient is φ = 77293440.

The previous prime is 90511549. The next prime is 90511567. The reversal of 90511561 is 16511509.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90511561 - 2⁷ = 90511433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90511567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21960 + ... + 25753.

It is an arithmetic number, because the mean of its divisors is an integer number (12978208).

Almost surely, 2^90511561 is an apocalyptic number.

It is an amenable number.

90511561 is a deficient number, since it is larger than the sum of its proper divisors (13314103).

90511561 is a wasteful number, since it uses less digits than its factorization.

90511561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47991.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 90511561 is about 9513.7564084856. The cubic root of 90511561 is about 448.9879494718.

The spelling of 90511561 in words is "ninety million, five hundred eleven thousand, five hundred sixty-one".