90471881 has 2 divisors, whose sum is σ = 90471882. Its totient is φ = 90471880.

The previous prime is 90471859. The next prime is 90471911. The reversal of 90471881 is 18817409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89946256 + 525625 = 9484^2 + 725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90471881 is a prime.

It is a super-2 number, since 2×90471881² = 16370322503356322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90471181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45235940 + 45235941.

It is an arithmetic number, because the mean of its divisors is an integer number (45235941).

Almost surely, 2^90471881 is an apocalyptic number.

It is an amenable number.

90471881 is a deficient number, since it is larger than the sum of its proper divisors (1).

90471881 is an equidigital number, since it uses as much as digits as its factorization.

90471881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 90471881 is about 9511.6707785751. The cubic root of 90471881 is about 448.9223282195.

The spelling of 90471881 in words is "ninety million, four hundred seventy-one thousand, eight hundred eighty-one".