90251421 has 32 divisors (see below), whose sum is σ = 134991360. Its totient is φ = 53274624.

The previous prime is 90251411. The next prime is 90251423. The reversal of 90251421 is 12415209.

It is not a de Polignac number, because 90251421 - 2¹⁹ = 89727133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90251391 and 90251400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90251423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96685 + ... + 97613.

It is an arithmetic number, because the mean of its divisors is an integer number (4218480).

Almost surely, 2^90251421 is an apocalyptic number.

It is an amenable number.

90251421 is a deficient number, since it is larger than the sum of its proper divisors (44739939).

90251421 is a wasteful number, since it uses less digits than its factorization.

90251421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 90251421 is about 9500.0747891793. The cubic root of 90251421 is about 448.5573901000.

The spelling of 90251421 in words is "ninety million, two hundred fifty-one thousand, four hundred twenty-one".