391692241 has 16 divisors (see below), whose sum is σ = 412108560. Its totient is φ = 371795200.

The previous prime is 391692199. The next prime is 391692253. The reversal of 391692241 is 142296193.

It can be written as a sum of positive squares in 8 ways, for example, as 29931841 + 361760400 = 5471^2 + 19020^2 .

It is a cyclic number.

It is not a de Polignac number, because 391692241 - 2⁷ = 391692113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 391692241.

It is not an unprimeable number, because it can be changed into a prime (391692281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 506331 + ... + 507103.

It is an arithmetic number, because the mean of its divisors is an integer number (25756785).

Almost surely, 2^391692241 is an apocalyptic number.

It is an amenable number.

391692241 is a deficient number, since it is larger than the sum of its proper divisors (20416319).

391692241 is a wasteful number, since it uses less digits than its factorization.

391692241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076.

The product of its digits is 23328, while the sum is 37.

The square root of 391692241 is about 19791.2162587346. The cubic root of 391692241 is about 731.6695639235.

The spelling of 391692241 in words is "three hundred ninety-one million, six hundred ninety-two thousand, two hundred forty-one".