501902819401 has 9 divisors (see below), whose sum is σ = 511589633191. Its totient is φ = 492396115432.

The previous prime is 501902819387. The next prime is 501902819477. The reversal of 501902819401 is 104918209105.

The square root of 501902819401 is 708451.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 361820295225 + 140082524176 = 601515^2 + 374276^2 .

It is not a de Polignac number, because 501902819401 - 2⁷ = 501902819273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (501902819101) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 37541220 + ... + 37554586.

Almost surely, 2^501902819401 is an apocalyptic number.

501902819401 is the 708451-st square number.

501902819401 is the 354226-th centered octagonal number.

It is an amenable number.

501902819401 is a deficient number, since it is larger than the sum of its proper divisors (9686813790).

501902819401 is an frugal number, since it uses more digits than its factorization.

501902819401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26840 (or 13420 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 501902819401 in words is "five hundred one billion, nine hundred two million, eight hundred nineteen thousand, four hundred one".