90401887 has 2 divisors, whose sum is σ = 90401888. Its totient is φ = 90401886.

The previous prime is 90401881. The next prime is 90401897. The reversal of 90401887 is 78810409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90401887 - 2³ = 90401879 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90401881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45200943 + 45200944.

It is an arithmetic number, because the mean of its divisors is an integer number (45200944).

Almost surely, 2^90401887 is an apocalyptic number.

90401887 is a deficient number, since it is larger than the sum of its proper divisors (1).

90401887 is an equidigital number, since it uses as much as digits as its factorization.

90401887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 90401887 is about 9507.9906920442. The cubic root of 90401887 is about 448.8065280548.

The spelling of 90401887 in words is "ninety million, four hundred one thousand, eight hundred eighty-seven".