90806971 has 4 divisors (see below), whose sum is σ = 91135072. Its totient is φ = 90478872.

The previous prime is 90806957. The next prime is 90806977. The reversal of 90806971 is 17960809.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90806971 - 2⁹ = 90806459 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (90806977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163635 + ... + 164188.

It is an arithmetic number, because the mean of its divisors is an integer number (22783768).

Almost surely, 2^90806971 is an apocalyptic number.

90806971 is a deficient number, since it is larger than the sum of its proper divisors (328101).

90806971 is a wasteful number, since it uses less digits than its factorization.

90806971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328100.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 90806971 is about 9529.2691744960. The cubic root of 90806971 is about 449.4758852741.

The spelling of 90806971 in words is "ninety million, eight hundred six thousand, nine hundred seventy-one".