291313997 has 16 divisors (see below), whose sum is σ = 319506432. Its totient is φ = 263995200.

The previous prime is 291313963. The next prime is 291314003. The reversal of 291313997 is 799313192.

It is a cyclic number.

It is not a de Polignac number, because 291313997 - 2⁶ = 291313933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291313907) 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, 165878 + ... + 167624.

It is an arithmetic number, because the mean of its divisors is an integer number (19969152).

Almost surely, 2^291313997 is an apocalyptic number.

It is an amenable number.

291313997 is a deficient number, since it is larger than the sum of its proper divisors (28192435).

291313997 is a wasteful number, since it uses less digits than its factorization.

291313997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988.

The product of its digits is 91854, while the sum is 44.

The square root of 291313997 is about 17067.9230429481. The cubic root of 291313997 is about 662.9087996479.

The spelling of 291313997 in words is "two hundred ninety-one million, three hundred thirteen thousand, nine hundred ninety-seven".