90970391 has 4 divisors (see below), whose sum is σ = 90989472. Its totient is φ = 90951312.

The previous prime is 90970387. The next prime is 90970433. The reversal of 90970391 is 19307909.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19307909 = 1913 ⋅10093.

It is a cyclic number.

It is not a de Polignac number, because 90970391 - 2² = 90970387 is a prime.

It is a super-2 number, since 2×90970391² = 16551224077385762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90970301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4466 + ... + 14208.

It is an arithmetic number, because the mean of its divisors is an integer number (22747368).

Almost surely, 2^90970391 is an apocalyptic number.

90970391 is a deficient number, since it is larger than the sum of its proper divisors (19081).

90970391 is an equidigital number, since it uses as much as digits as its factorization.

90970391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19080.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 90970391 is about 9537.8399546228. The cubic root of 90970391 is about 449.7453555183.

The spelling of 90970391 in words is "ninety million, nine hundred seventy thousand, three hundred ninety-one".