389951540521 has 27 divisors (see below), whose sum is σ = 419318662959. Its totient is φ = 362567052288.

The previous prime is 389951540507. The next prime is 389951540533. The reversal of 389951540521 is 125045159983.

The square root of 389951540521 is 624461.

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

It can be written as a sum of positive squares in 13 ways, for example, as 98589092121 + 291362448400 = 313989^2 + 539780^2 .

It is not a de Polignac number, because 389951540521 - 2³³ = 381361605929 is a prime.

It is a super-2 number, since 2×389951540521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389951540921) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1157126065 + ... + 1157126401.

Almost surely, 2^389951540521 is an apocalyptic number.

389951540521 is the 624461-st square number.

389951540521 is the 312231-st centered octagonal number.

It is an amenable number.

389951540521 is a deficient number, since it is larger than the sum of its proper divisors (29367122438).

389951540521 is an frugal number, since it uses more digits than its factorization.

389951540521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 52.

The spelling of 389951540521 in words is "three hundred eighty-nine billion, nine hundred fifty-one million, five hundred forty thousand, five hundred twenty-one".