291057097 has 2 divisors, whose sum is σ = 291057098. Its totient is φ = 291057096.

The previous prime is 291057083. The next prime is 291057101. The reversal of 291057097 is 790750192.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 288354361 + 2702736 = 16981^2 + 1644^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291057097 is a prime.

It is a Chen prime.

It is equal to p_15793762 and since 291057097 and 15793762 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (291057077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145528548 + 145528549.

It is an arithmetic number, because the mean of its divisors is an integer number (145528549).

Almost surely, 2^291057097 is an apocalyptic number.

It is an amenable number.

291057097 is a deficient number, since it is larger than the sum of its proper divisors (1).

291057097 is an equidigital number, since it uses as much as digits as its factorization.

291057097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 291057097 is about 17060.3955698571. The cubic root of 291057097 is about 662.7138766920.

The spelling of 291057097 in words is "two hundred ninety-one million, fifty-seven thousand, ninety-seven".