901191455512921 has 4 divisors (see below), whose sum is σ = 901196779261392. Its totient is φ = 901186131764452.

The previous prime is 901191455512897. The next prime is 901191455512927. The reversal of 901191455512921 is 129215554191109.

901191455512921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 901191455512921 - 2⁷ = 901191455512793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (901191455512927) 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, 2661620311 + ... + 2661958876.

It is an arithmetic number, because the mean of its divisors is an integer number (225299194815348).

Almost surely, 2^{901191455512921} is an apocalyptic number.

It is an amenable number.

901191455512921 is a deficient number, since it is larger than the sum of its proper divisors (5323748471).

901191455512921 is a wasteful number, since it uses less digits than its factorization.

901191455512921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5323748470.

The product of its (nonzero) digits is 1458000, while the sum is 55.

The spelling of 901191455512921 in words is "nine hundred one trillion, one hundred ninety-one billion, four hundred fifty-five million, five hundred twelve thousand, nine hundred twenty-one".