90871601 has 2 divisors, whose sum is σ = 90871602. Its totient is φ = 90871600.

The previous prime is 90871591. The next prime is 90871603. The reversal of 90871601 is 10617809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84621601 + 6250000 = 9199^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 90871601 - 2¹⁴ = 90855217 is a prime.

Together with 90871603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90871603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45435800 + 45435801.

It is an arithmetic number, because the mean of its divisors is an integer number (45435801).

Almost surely, 2^90871601 is an apocalyptic number.

It is an amenable number.

90871601 is a deficient number, since it is larger than the sum of its proper divisors (1).

90871601 is an equidigital number, since it uses as much as digits as its factorization.

90871601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 90871601 is about 9532.6597023076. The cubic root of 90871601 is about 449.5824950679.

The spelling of 90871601 in words is "ninety million, eight hundred seventy-one thousand, six hundred one".