1291912097 has 24 divisors (see below), whose sum is σ = 1558008360. Its totient is φ = 1066867200.

The previous prime is 1291912051. The next prime is 1291912103. The reversal of 1291912097 is 7902191921.

It can be written as a sum of positive squares in 4 ways, for example, as 10916416 + 1280995681 = 3304^2 + 35791^2 .

It is not a de Polignac number, because 1291912097 - 2⁶ = 1291912033 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291912007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1075097 + ... + 1076297.

It is an arithmetic number, because the mean of its divisors is an integer number (64917015).

Almost surely, 2^1291912097 is an apocalyptic number.

It is an amenable number.

1291912097 is a deficient number, since it is larger than the sum of its proper divisors (266096263).

1291912097 is a wasteful number, since it uses less digits than its factorization.

1291912097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001 (or 1994 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 41.

The square root of 1291912097 is about 35943.1787269852. The cubic root of 1291912097 is about 1089.1248191908.

The spelling of 1291912097 in words is "one billion, two hundred ninety-one million, nine hundred twelve thousand, ninety-seven".