1291161319942 has 16 divisors (see below), whose sum is σ = 2101643680752. Its totient is φ = 591371595360.

The previous prime is 1291161319933. The next prime is 1291161319949. The reversal of 1291161319942 is 2499131611921.

It is a super-2 number, since 2×1291161319942² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291161319949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189538773 + ... + 189545584.

It is an arithmetic number, because the mean of its divisors is an integer number (131352730047).

Almost surely, 2^{1291161319942} is an apocalyptic number.

1291161319942 is a deficient number, since it is larger than the sum of its proper divisors (810482360810).

1291161319942 is a wasteful number, since it uses less digits than its factorization.

1291161319942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379084503.

The product of its digits is 209952, while the sum is 49.

The spelling of 1291161319942 in words is "one trillion, two hundred ninety-one billion, one hundred sixty-one million, three hundred nineteen thousand, nine hundred forty-two".