90780971 has 2 divisors, whose sum is σ = 90780972. Its totient is φ = 90780970.

The previous prime is 90780967. The next prime is 90780973. The reversal of 90780971 is 17908709.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90780971 - 2² = 90780967 is a prime.

Together with 90780973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90780973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45390485 + 45390486.

It is an arithmetic number, because the mean of its divisors is an integer number (45390486).

Almost surely, 2^90780971 is an apocalyptic number.

90780971 is a deficient number, since it is larger than the sum of its proper divisors (1).

90780971 is an equidigital number, since it uses as much as digits as its factorization.

90780971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 90780971 is about 9527.9048588869. The cubic root of 90780971 is about 449.4329829565.

The spelling of 90780971 in words is "ninety million, seven hundred eighty thousand, nine hundred seventy-one".