90157421 has 4 divisors (see below), whose sum is σ = 92075712. Its totient is φ = 88239132.

The previous prime is 90157391. The next prime is 90157423. The reversal of 90157421 is 12475109.

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 90157421 - 2⁶ = 90157357 is a prime.

It is a super-2 number, since 2×90157421² = 16256721122742482, 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 (90157423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959075 + ... + 959168.

It is an arithmetic number, because the mean of its divisors is an integer number (23018928).

Almost surely, 2^90157421 is an apocalyptic number.

It is an amenable number.

90157421 is a deficient number, since it is larger than the sum of its proper divisors (1918291).

90157421 is a wasteful number, since it uses less digits than its factorization.

90157421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918290.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 90157421 is about 9495.1261708310. The cubic root of 90157421 is about 448.4016066186.

The spelling of 90157421 in words is "ninety million, one hundred fifty-seven thousand, four hundred twenty-one".