90887722518381 has 4 divisors (see below), whose sum is σ = 121183630024512. Its totient is φ = 60591815012252.

The previous prime is 90887722518361. The next prime is 90887722518391. The reversal of 90887722518381 is 18381522778809.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90887722518381 - 2⁹ = 90887722517869 is a prime.

It is a super-2 number, since 2×90887722518381² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90887722518301) 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, 15147953753061 + ... + 15147953753066.

It is an arithmetic number, because the mean of its divisors is an integer number (30295907506128).

Almost surely, 2^{90887722518381} is an apocalyptic number.

It is an amenable number.

90887722518381 is a deficient number, since it is larger than the sum of its proper divisors (30295907506131).

90887722518381 is a wasteful number, since it uses less digits than its factorization.

90887722518381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30295907506130.

The product of its (nonzero) digits is 108380160, while the sum is 69.

The spelling of 90887722518381 in words is "ninety trillion, eight hundred eighty-seven billion, seven hundred twenty-two million, five hundred eighteen thousand, three hundred eighty-one".