291001200121 has 4 divisors (see below), whose sum is σ = 291201753744. Its totient is φ = 290800646500.

The previous prime is 291001200043. The next prime is 291001200131. The reversal of 291001200121 is 121002100192.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291001200121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291001200131) 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, 100274635 + ... + 100277536.

It is an arithmetic number, because the mean of its divisors is an integer number (72800438436).

Almost surely, 2^291001200121 is an apocalyptic number.

It is an amenable number.

291001200121 is a deficient number, since it is larger than the sum of its proper divisors (200553623).

291001200121 is a wasteful number, since it uses less digits than its factorization.

291001200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200553622.

The product of its (nonzero) digits is 72, while the sum is 19.

It can be divided in two parts, 29100 and 1200121, that added together give a palindrome (1229221).

The spelling of 291001200121 in words is "two hundred ninety-one billion, one million, two hundred thousand, one hundred twenty-one".