970391561 has 4 divisors (see below), whose sum is σ = 974418324. Its totient is φ = 966364800.

The previous prime is 970391557. The next prime is 970391573. The reversal of 970391561 is 165193079.

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

It can be written as a sum of positive squares in 2 ways, for example, as 366952336 + 603439225 = 19156^2 + 24565^2 .

It is a cyclic number.

It is not a de Polignac number, because 970391561 - 2² = 970391557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (970391581) 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, 2013020 + ... + 2013501.

It is an arithmetic number, because the mean of its divisors is an integer number (243604581).

Almost surely, 2^970391561 is an apocalyptic number.

It is an amenable number.

970391561 is a deficient number, since it is larger than the sum of its proper divisors (4026763).

970391561 is a wasteful number, since it uses less digits than its factorization.

970391561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4026762.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 970391561 is about 31151.1085035509. The cubic root of 970391561 is about 990.0314791201.

The spelling of 970391561 in words is "nine hundred seventy million, three hundred ninety-one thousand, five hundred sixty-one".