388903151641 has 3 divisors (see below), whose sum is σ = 388903775263. Its totient is φ = 388902528020.

The previous prime is 388903151563. The next prime is 388903151653. The reversal of 388903151641 is 146151309883.

The square root of 388903151641 is 623621.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 370672751241 + 18230400400 = 608829^2 + 135020^2 .

It is not a de Polignac number, because 388903151641 - 2⁹ = 388903151129 is a prime.

It is a super-2 number, since 2×388903151641² (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 (388903151671) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 311811 + ... + 935431.

Almost surely, 2^388903151641 is an apocalyptic number.

388903151641 is the 623621-st square number.

388903151641 is the 311811-st centered octagonal number.

It is an amenable number.

388903151641 is a deficient number, since it is larger than the sum of its proper divisors (623622).

388903151641 is an frugal number, since it uses more digits than its factorization.

388903151641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247242 (or 623621 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

Multiplying 388903151641 by its sum of digits (49), we get a square (19056254430409 = 4365347²).

The spelling of 388903151641 in words is "three hundred eighty-eight billion, nine hundred three million, one hundred fifty-one thousand, six hundred forty-one".