291121955 has 8 divisors (see below), whose sum is σ = 352013904. Its totient is φ = 231119200.

The previous prime is 291121931. The next prime is 291121993. The reversal of 291121955 is 559121192.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 291121955 - 2²⁰ = 290073379 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221576 + ... + 222885.

It is an arithmetic number, because the mean of its divisors is an integer number (44001738).

Almost surely, 2^291121955 is an apocalyptic number.

291121955 is a deficient number, since it is larger than the sum of its proper divisors (60891949).

291121955 is a wasteful number, since it uses less digits than its factorization.

291121955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444597.

The product of its digits is 8100, while the sum is 35.

The square root of 291121955 is about 17062.2962991504. The cubic root of 291121955 is about 662.7630985397.

The spelling of 291121955 in words is "two hundred ninety-one million, one hundred twenty-one thousand, nine hundred fifty-five".