90142889 has 2 divisors, whose sum is σ = 90142890. Its totient is φ = 90142888.

The previous prime is 90142831. The next prime is 90142901. The reversal of 90142889 is 98824109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58782889 + 31360000 = 7667^2 + 5600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90142889 is a prime.

It is not a weakly prime, because it can be changed into another prime (90142489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45071444 + 45071445.

It is an arithmetic number, because the mean of its divisors is an integer number (45071445).

Almost surely, 2^90142889 is an apocalyptic number.

It is an amenable number.

90142889 is a deficient number, since it is larger than the sum of its proper divisors (1).

90142889 is an equidigital number, since it uses as much as digits as its factorization.

90142889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 90142889 is about 9494.3609052953. The cubic root of 90142889 is about 448.3775134927.

The spelling of 90142889 in words is "ninety million, one hundred forty-two thousand, eight hundred eighty-nine".