291645401 has 4 divisors (see below), whose sum is σ = 292897332. Its totient is φ = 290393472.

The previous prime is 291645391. The next prime is 291645407. The reversal of 291645401 is 104546192.

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 192543376 + 99102025 = 13876^2 + 9955^2 .

It is a cyclic number.

It is not a de Polignac number, because 291645401 - 2⁶ = 291645337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291645407) 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, 625616 + ... + 626081.

It is an arithmetic number, because the mean of its divisors is an integer number (73224333).

Almost surely, 2^291645401 is an apocalyptic number.

It is an amenable number.

291645401 is a deficient number, since it is larger than the sum of its proper divisors (1251931).

291645401 is a wasteful number, since it uses less digits than its factorization.

291645401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251930.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 291645401 is about 17077.6286702809. The cubic root of 291645401 is about 663.1600833426.

The spelling of 291645401 in words is "two hundred ninety-one million, six hundred forty-five thousand, four hundred one".