291656872491001 has 16 divisors (see below), whose sum is σ = 299959140406464. Its totient is φ = 283423719668544.

The previous prime is 291656872490983. The next prime is 291656872491071. The reversal of 291656872491001 is 100194278656192.

It is a cyclic number.

It is not a de Polignac number, because 291656872491001 - 2¹⁵ = 291656872458233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291656872491071) 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, 639815506 + ... + 640271188.

It is an arithmetic number, because the mean of its divisors is an integer number (18747446275404).

Almost surely, 2^{291656872491001} is an apocalyptic number.

It is an amenable number.

291656872491001 is a deficient number, since it is larger than the sum of its proper divisors (8302267915463).

291656872491001 is a wasteful number, since it uses less digits than its factorization.

291656872491001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531480.

The product of its (nonzero) digits is 13063680, while the sum is 61.

The spelling of 291656872491001 in words is "two hundred ninety-one trillion, six hundred fifty-six billion, eight hundred seventy-two million, four hundred ninety-one thousand, one".