901991001902 has 8 divisors (see below), whose sum is σ = 1352992410000. Its totient is φ = 450993531904.

The previous prime is 901991001887. The next prime is 901991001907. The reversal of 901991001902 is 209100199109.

It is a happy number.

901991001902 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 self number, because there is not a number n which added to its sum of digits gives 901991001902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901991001907) 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, 323027 + ... + 1381422.

It is an arithmetic number, because the mean of its divisors is an integer number (169124051250).

Almost surely, 2^901991001902 is an apocalyptic number.

901991001902 is a deficient number, since it is larger than the sum of its proper divisors (451001408098).

901991001902 is a wasteful number, since it uses less digits than its factorization.

901991001902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969050.

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 901991001902 in words is "nine hundred one billion, nine hundred ninety-one million, one thousand, nine hundred two".