501121901 has 8 divisors (see below), whose sum is σ = 573623424. Its totient is φ = 428848560.

The previous prime is 501121867. The next prime is 501121921. The reversal of 501121901 is 109121105.

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

It is not a de Polignac number, because 501121901 - 2²² = 496927597 is a prime.

It is a super-2 number, since 2×501121901² = 502246319323707602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501121921) 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, 52310 + ... + 61143.

It is an arithmetic number, because the mean of its divisors is an integer number (71702928).

Almost surely, 2^501121901 is an apocalyptic number.

It is an amenable number.

501121901 is a deficient number, since it is larger than the sum of its proper divisors (72501523).

501121901 is a wasteful number, since it uses less digits than its factorization.

501121901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114091.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 501121901 is about 22385.7521874964. The cubic root of 501121901 is about 794.2937181457.

The spelling of 501121901 in words is "five hundred one million, one hundred twenty-one thousand, nine hundred one".