2931897609 has 9 divisors (see below), whose sum is σ = 4235197863. Its totient is φ = 1954490112.

The previous prime is 2931897601. The next prime is 2931897623. The reversal of 2931897609 is 9067981392.

The square root of 2931897609 is 54147.

It is a perfect power (a square), and thus also a powerful number.

2931897609 is a `hidden beast` number, since 29 + 3 + 1 + 8 + 9 + 7 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2539857609 + 392040000 = 50397^2 + 19800^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 2931897609 - 2³ = 2931897601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2931897601) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 153417 + ... + 171465.

Almost surely, 2^2931897609 is an apocalyptic number.

2931897609 is the 54147-th square number.

2931897609 is the 27074-th centered octagonal number.

It is an amenable number.

2931897609 is a deficient number, since it is larger than the sum of its proper divisors (1303300254).

2931897609 is an frugal number, since it uses more digits than its factorization.

2931897609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36104 (or 18052 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The cubic root of 2931897609 is about 1431.2525269013.

The spelling of 2931897609 in words is "two billion, nine hundred thirty-one million, eight hundred ninety-seven thousand, six hundred nine".