901221128 has 8 divisors (see below), whose sum is σ = 1689789630. Its totient is φ = 450610560.

The previous prime is 901221109. The next prime is 901221131. The reversal of 901221128 is 821122109.

901221128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 896283844 + 4937284 = 29938^2 + 2222^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 901221097 and 901221106.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56326313 + ... + 56326328.

Almost surely, 2^901221128 is an apocalyptic number.

It is an amenable number.

901221128 is a deficient number, since it is larger than the sum of its proper divisors (788568502).

901221128 is a wasteful number, since it uses less digits than its factorization.

901221128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112652647 (or 112652643 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 901221128 is about 30020.3452345239. The cubic root of 901221128 is about 965.9258487920.

The spelling of 901221128 in words is "nine hundred one million, two hundred twenty-one thousand, one hundred twenty-eight".