291145969 has 9 divisors (see below), whose sum is σ = 295703499. Its totient is φ = 286658400.

The previous prime is 291145951. The next prime is 291145979. The reversal of 291145969 is 969541192.

It is a happy number.

The square root of 291145969 is 17063.

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., 5130225 + 286015744 = 2265^2 + 16912^2 .

It is not a de Polignac number, because 291145969 - 2²¹ = 289048817 is a prime.

It is a super-2 number, since 2×291145969² = 169531950529897922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291145979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1928044 + ... + 1928194.

Almost surely, 2^291145969 is an apocalyptic number.

291145969 is the 17063-rd square number.

291145969 is the 8532-nd centered octagonal number.

It is an amenable number.

291145969 is a deficient number, since it is larger than the sum of its proper divisors (4557530).

291145969 is an frugal number, since it uses more digits than its factorization.

291145969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 264 counting only the distinct ones).

The product of its digits is 174960, while the sum is 46.

The cubic root of 291145969 is about 662.7813213214.

The spelling of 291145969 in words is "two hundred ninety-one million, one hundred forty-five thousand, nine hundred sixty-nine".