591121969 has 9 divisors (see below), whose sum is σ = 606914689. Its totient is φ = 575731840.

The previous prime is 591121967. The next prime is 591121991. The reversal of 591121969 is 969121195.

The square root of 591121969 is 24313.

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

It can be written as a sum of positive squares in 4 ways, for example, as 110986225 + 480135744 = 10535^2 + 21912^2 .

It is not a de Polignac number, because 591121969 - 2¹ = 591121967 is a prime.

It is a super-2 number, since 2×591121969² = 698850364468873922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (591121963) 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, 996537 + ... + 997129.

Almost surely, 2^591121969 is an apocalyptic number.

591121969 is the 24313-rd square number.

591121969 is the 12157-th centered octagonal number.

It is an amenable number.

591121969 is a deficient number, since it is larger than the sum of its proper divisors (15792720).

591121969 is an frugal number, since it uses more digits than its factorization.

591121969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268 (or 634 counting only the distinct ones).

The product of its digits is 43740, while the sum is 43.

The cubic root of 591121969 is about 839.2519649170.

The spelling of 591121969 in words is "five hundred ninety-one million, one hundred twenty-one thousand, nine hundred sixty-nine".