1291692051 has 12 divisors (see below), whose sum is σ = 2009298928. Its totient is φ = 794887344.

The previous prime is 1291692049. The next prime is 1291692053. The reversal of 1291692051 is 1502961921.

It is an interprime number because it is at equal distance from previous prime (1291692049) and next prime (1291692053).

It is not a de Polignac number, because 1291692051 - 2¹ = 1291692049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1291691997 and 1291692015.

It is not an unprimeable number, because it can be changed into a prime (1291692053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5519935 + ... + 5520168.

Almost surely, 2^1291692051 is an apocalyptic number.

1291692051 is a deficient number, since it is larger than the sum of its proper divisors (717606877).

1291692051 is a wasteful number, since it uses less digits than its factorization.

1291692051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11040122 (or 11040119 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 1291692051 is about 35940.1175707593. The cubic root of 1291692051 is about 1089.0629803169.

The spelling of 1291692051 in words is "one billion, two hundred ninety-one million, six hundred ninety-two thousand, fifty-one".