391098893641 has 9 divisors (see below), whose sum is σ = 415469288199. Its totient is φ = 368083070304.

The previous prime is 391098893621. The next prime is 391098893657. The reversal of 391098893641 is 146398890193.

The square root of 391098893641 is 625379.

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., 304488758025 + 86610135616 = 551805^2 + 294296^2 .

It is not a de Polignac number, because 391098893641 - 2¹¹ = 391098891593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 391098893641.

It is not an unprimeable number, because it can be changed into a prime (391098893621) 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, 10613050 + ... + 10649836.

Almost surely, 2^391098893641 is an apocalyptic number.

391098893641 is the 625379-th square number.

391098893641 is the 312690-th centered octagonal number.

It is an amenable number.

391098893641 is a deficient number, since it is larger than the sum of its proper divisors (24370394558).

391098893641 is an frugal number, since it uses more digits than its factorization.

391098893641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73608 (or 36804 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 61.

The spelling of 391098893641 in words is "three hundred ninety-one billion, ninety-eight million, eight hundred ninety-three thousand, six hundred forty-one".