1291832537 has 2 divisors, whose sum is σ = 1291832538. Its totient is φ = 1291832536.

The previous prime is 1291832483. The next prime is 1291832543. The reversal of 1291832537 is 7352381921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1061521561 + 230310976 = 32581^2 + 15176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291832537 - 2⁶ = 1291832473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291832494 and 1291832503.

It is not a weakly prime, because it can be changed into another prime (1291832587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645916268 + 645916269.

It is an arithmetic number, because the mean of its divisors is an integer number (645916269).

Almost surely, 2^1291832537 is an apocalyptic number.

It is an amenable number.

1291832537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291832537 is an equidigital number, since it uses as much as digits as its factorization.

1291832537 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 1291832537 is about 35942.0719630908. The cubic root of 1291832537 is about 1089.1024614908.

The spelling of 1291832537 in words is "one billion, two hundred ninety-one million, eight hundred thirty-two thousand, five hundred thirty-seven".