90070091 has 2 divisors, whose sum is σ = 90070092. Its totient is φ = 90070090.

The previous prime is 90070087. The next prime is 90070109. The reversal of 90070091 is 19007009.

Together with next prime (90070109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90070091 - 2² = 90070087 is a prime.

It is a super-2 number, since 2×90070091² = 16225242585496562, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90070091.

It is not a weakly prime, because it can be changed into another prime (90070031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45035045 + 45035046.

It is an arithmetic number, because the mean of its divisors is an integer number (45035046).

Almost surely, 2^90070091 is an apocalyptic number.

90070091 is a deficient number, since it is larger than the sum of its proper divisors (1).

90070091 is an equidigital number, since it uses as much as digits as its factorization.

90070091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 90070091 is about 9490.5263816081. The cubic root of 90070091 is about 448.2567800759.

The spelling of 90070091 in words is "ninety million, seventy thousand, ninety-one".