90861438527 has 4 divisors (see below), whose sum is σ = 93077571216. Its totient is φ = 88645305840.

The previous prime is 90861438509. The next prime is 90861438539. The reversal of 90861438527 is 72583416809.

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 90861438527 - 2⁸ = 90861438271 is a prime.

It is a super-2 number, since 2×90861438527² (a number of 23 digits) 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 (90861408527) 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, 1108066283 + ... + 1108066364.

It is an arithmetic number, because the mean of its divisors is an integer number (23269392804).

It is a 1-persistent number, because it is pandigital, but 2⋅90861438527 = 181722877054 is not.

Almost surely, 2^90861438527 is an apocalyptic number.

90861438527 is a deficient number, since it is larger than the sum of its proper divisors (2216132689).

90861438527 is a wasteful number, since it uses less digits than its factorization.

90861438527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216132688.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 90861438527 in words is "ninety billion, eight hundred sixty-one million, four hundred thirty-eight thousand, five hundred twenty-seven".