1291662527 has 2 divisors, whose sum is σ = 1291662528. Its totient is φ = 1291662526.

The previous prime is 1291662481. The next prime is 1291662551. The reversal of 1291662527 is 7252661921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1291662527 - 2⁸ = 1291662271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291662557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645831263 + 645831264.

It is an arithmetic number, because the mean of its divisors is an integer number (645831264).

Almost surely, 2^1291662527 is an apocalyptic number.

1291662527 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291662527 is an equidigital number, since it uses as much as digits as its factorization.

1291662527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 1291662527 is about 35939.7068296334. The cubic root of 1291662527 is about 1089.0546827405.

The spelling of 1291662527 in words is "one billion, two hundred ninety-one million, six hundred sixty-two thousand, five hundred twenty-seven".