1291767057 has 18 divisors (see below), whose sum is σ = 2170520898. Its totient is φ = 738152352.

The previous prime is 1291767053. The next prime is 1291767077. The reversal of 1291767057 is 7507671921.

It can be written as a sum of positive squares in only one way, i.e., 1261031121 + 30735936 = 35511^2 + 5544^2 .

It is not a de Polignac number, because 1291767057 - 2² = 1291767053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1291767053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1464148 + ... + 1465029.

Almost surely, 2^1291767057 is an apocalyptic number.

It is an amenable number.

1291767057 is a deficient number, since it is larger than the sum of its proper divisors (878753841).

1291767057 is a wasteful number, since it uses less digits than its factorization.

1291767057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929197 (or 2929187 counting only the distinct ones).

The product of its (nonzero) digits is 185220, while the sum is 45.

The square root of 1291767057 is about 35941.1610413465. The cubic root of 1291767057 is about 1089.0840598192.

The spelling of 1291767057 in words is "one billion, two hundred ninety-one million, seven hundred sixty-seven thousand, fifty-seven".