291297897 has 16 divisors (see below), whose sum is σ = 470784960. Its totient is φ = 176544000.

The previous prime is 291297827. The next prime is 291297901. The reversal of 291297897 is 798792192.

It is not a de Polignac number, because 291297897 - 2⁸ = 291297641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (291297827) 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, 490104 + ... + 490697.

It is an arithmetic number, because the mean of its divisors is an integer number (29424060).

Almost surely, 2^291297897 is an apocalyptic number.

291297897 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

291297897 is a deficient number, since it is larger than the sum of its proper divisors (179487063).

291297897 is a wasteful number, since it uses less digits than its factorization.

291297897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980821 (or 980815 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 291297897 is about 17067.4513914644. The cubic root of 291297897 is about 662.8965871344.

The spelling of 291297897 in words is "two hundred ninety-one million, two hundred ninety-seven thousand, eight hundred ninety-seven".