90642973 has 2 divisors, whose sum is σ = 90642974. Its totient is φ = 90642972.

The previous prime is 90642971. The next prime is 90642991. The reversal of 90642973 is 37924609.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80676324 + 9966649 = 8982^2 + 3157^2 .

It is a cyclic number.

It is not a de Polignac number, because 90642973 - 2¹ = 90642971 is a prime.

It is a super-2 number, since 2×90642973² = 16432297108557458, which contains 22 as substring.

Together with 90642971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90642971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45321486 + 45321487.

It is an arithmetic number, because the mean of its divisors is an integer number (45321487).

Almost surely, 2^90642973 is an apocalyptic number.

It is an amenable number.

90642973 is a deficient number, since it is larger than the sum of its proper divisors (1).

90642973 is an equidigital number, since it uses as much as digits as its factorization.

90642973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 90642973 is about 9520.6603237381. The cubic root of 90642973 is about 449.2051367274.

The spelling of 90642973 in words is "ninety million, six hundred forty-two thousand, nine hundred seventy-three".