900121691 has 8 divisors (see below), whose sum is σ = 1064183520. Its totient is φ = 744928128.

The previous prime is 900121687. The next prime is 900121711. The reversal of 900121691 is 196121009.

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

It is not a de Polignac number, because 900121691 - 2² = 900121687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900121591) 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, 2216846 + ... + 2217251.

It is an arithmetic number, because the mean of its divisors is an integer number (133022940).

Almost surely, 2^900121691 is an apocalyptic number.

900121691 is a deficient number, since it is larger than the sum of its proper divisors (164061829).

900121691 is a wasteful number, since it uses less digits than its factorization.

900121691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434133.

The product of its (nonzero) digits is 972, while the sum is 29.

The square root of 900121691 is about 30002.0281147792. The cubic root of 900121691 is about 965.5328979663.

The spelling of 900121691 in words is "nine hundred million, one hundred twenty-one thousand, six hundred ninety-one".