997580641 has 4 divisors (see below), whose sum is σ = 1013934484. Its totient is φ = 981226800.

The previous prime is 997580609. The next prime is 997580659. The reversal of 997580641 is 146085799.

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 93315600 + 904265041 = 9660^2 + 30071^2 .

It is a cyclic number.

It is not a de Polignac number, because 997580641 - 2⁵ = 997580609 is a prime.

It is the 31585-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997580741) by changing a digit.

It is a nontrivial repunit in base 31584.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8176830 + ... + 8176951.

It is an arithmetic number, because the mean of its divisors is an integer number (253483621).

Almost surely, 2^997580641 is an apocalyptic number.

It is an amenable number.

997580641 is a deficient number, since it is larger than the sum of its proper divisors (16353843).

997580641 is a wasteful number, since it uses less digits than its factorization.

997580641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16353842.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 997580641 is about 31584.5000118729. The cubic root of 997580641 is about 999.1928957580.

The spelling of 997580641 in words is "nine hundred ninety-seven million, five hundred eighty thousand, six hundred forty-one".