90433381 has 2 divisors, whose sum is σ = 90433382. Its totient is φ = 90433380.

The previous prime is 90433379. The next prime is 90433403. The reversal of 90433381 is 18333409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88830625 + 1602756 = 9425^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 90433381 - 2¹ = 90433379 is a prime.

It is a super-2 number, since 2×90433381² = 16356392798182322, which contains 22 as substring.

Together with 90433379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90433181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45216690 + 45216691.

It is an arithmetic number, because the mean of its divisors is an integer number (45216691).

Almost surely, 2^90433381 is an apocalyptic number.

It is an amenable number.

90433381 is a deficient number, since it is larger than the sum of its proper divisors (1).

90433381 is an equidigital number, since it uses as much as digits as its factorization.

90433381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 90433381 is about 9509.6467337120. The cubic root of 90433381 is about 448.8586400633.

The spelling of 90433381 in words is "ninety million, four hundred thirty-three thousand, three hundred eighty-one".