291249113 has 2 divisors, whose sum is σ = 291249114. Its totient is φ = 291249112.

The previous prime is 291249109. The next prime is 291249131. The reversal of 291249113 is 311942192.

291249113 = 12067² + 12068².

Together with next prime (291249131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145636624 + 145612489 = 12068^2 + 12067^2 .

It is a cyclic number.

It is not a de Polignac number, because 291249113 - 2² = 291249109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 291249113.

It is not a weakly prime, because it can be changed into another prime (291249103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145624556 + 145624557.

It is an arithmetic number, because the mean of its divisors is an integer number (145624557).

Almost surely, 2^291249113 is an apocalyptic number.

291249113 is the 12068-th centered square number.

It is an amenable number.

291249113 is a deficient number, since it is larger than the sum of its proper divisors (1).

291249113 is an equidigital number, since it uses as much as digits as its factorization.

291249113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 291249113 is about 17066.0221785863. The cubic root of 291249113 is about 662.8595797125.

It can be divided in two parts, 2912 and 49113, that added together give a palindrome (52025).

The spelling of 291249113 in words is "two hundred ninety-one million, two hundred forty-nine thousand, one hundred thirteen".