291457 has 2 divisors, whose sum is σ = 291458. Its totient is φ = 291456.

The previous prime is 291443. The next prime is 291481. The reversal of 291457 is 754192.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 83521 = 456^2 + 289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-291457 is a prime.

It is not a weakly prime, because it can be changed into another prime (291437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145728 + 145729.

It is an arithmetic number, because the mean of its divisors is an integer number (145729).

2²⁹¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

291457 is a deficient number, since it is larger than the sum of its proper divisors (1).

291457 is an equidigital number, since it uses as much as digits as its factorization.

291457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 291457 is about 539.8675763555. The cubic root of 291457 is about 66.3017253573.

The spelling of 291457 in words is "two hundred ninety-one thousand, four hundred fifty-seven".