291240013 has 2 divisors, whose sum is σ = 291240014. Its totient is φ = 291240012.

The previous prime is 291239969. The next prime is 291240023. The reversal of 291240013 is 310042192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176278729 + 114961284 = 13277^2 + 10722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291240013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (291240023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145620006 + 145620007.

It is an arithmetic number, because the mean of its divisors is an integer number (145620007).

Almost surely, 2^291240013 is an apocalyptic number.

It is an amenable number.

291240013 is a deficient number, since it is larger than the sum of its proper divisors (1).

291240013 is an equidigital number, since it uses as much as digits as its factorization.

291240013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 291240013 is about 17065.7555648732. The cubic root of 291240013 is about 662.8526760177.

The spelling of 291240013 in words is "two hundred ninety-one million, two hundred forty thousand, thirteen".