914721991 has 8 divisors (see below), whose sum is σ = 944640000. Its totient is φ = 884829720.

The previous prime is 914721979. The next prime is 914722021. The reversal of 914721991 is 199127419.

914721991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 914721991 - 2¹⁹ = 914197703 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 (914721971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88050 + ... + 97888.

It is an arithmetic number, because the mean of its divisors is an integer number (118080000).

Almost surely, 2^914721991 is an apocalyptic number.

914721991 is a deficient number, since it is larger than the sum of its proper divisors (29918009).

914721991 is a wasteful number, since it uses less digits than its factorization.

914721991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12869.

The product of its digits is 40824, while the sum is 43.

The square root of 914721991 is about 30244.3712283790. The cubic root of 914721991 is about 970.7253549975.

The spelling of 914721991 in words is "nine hundred fourteen million, seven hundred twenty-one thousand, nine hundred ninety-one".