1291357 has 2 divisors, whose sum is σ = 1291358. Its totient is φ = 1291356.

The previous prime is 1291349. The next prime is 1291369. The reversal of 1291357 is 7531921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1223236 + 68121 = 1106^2 + 261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291357 - 2³ = 1291349 is a prime.

It is a Chen prime.

It is equal to p₉₉₄₂₄ and since 1291357 and 99424 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645678 + 645679.

It is an arithmetic number, because the mean of its divisors is an integer number (645679).

2^1291357 is an apocalyptic number.

It is an amenable number.

1291357 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291357 is an equidigital number, since it uses as much as digits as its factorization.

1291357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 28.

The square root of 1291357 is about 1136.3788980793. The cubic root of 1291357 is about 108.8968808440.

The spelling of 1291357 in words is "one million, two hundred ninety-one thousand, three hundred fifty-seven".