391367089 has 9 divisors (see below), whose sum is σ = 398271339. Its totient is φ = 384581520.

The previous prime is 391367059. The next prime is 391367101. The reversal of 391367089 is 980763193.

The square root of 391367089 is 19783.

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., 222159025 + 169208064 = 14905^2 + 13008^2 .

It is a de Polignac number, because none of the positive numbers 2^k-391367089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391367059) 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, 1444024 + ... + 1444294.

It is an arithmetic number, because the mean of its divisors is an integer number (44252371).

Almost surely, 2^391367089 is an apocalyptic number.

391367089 is the 19783-rd square number.

391367089 is the 9892-nd centered octagonal number.

It is an amenable number.

391367089 is a deficient number, since it is larger than the sum of its proper divisors (6904250).

391367089 is an frugal number, since it uses more digits than its factorization.

391367089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The cubic root of 391367089 is about 731.4670497579.

It can be divided in two parts, 39136 and 7089, that added together give a square (46225 = 215²).

The spelling of 391367089 in words is "three hundred ninety-one million, three hundred sixty-seven thousand, eighty-nine".