1291981134 has 16 divisors (see below), whose sum is σ = 2587052160. Its totient is φ = 430145400.

The previous prime is 1291981129. The next prime is 1291981183. The reversal of 1291981134 is 4311891921.

It is a super-2 number, since 2×1291981134² = 3338430501223851912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1291981092 and 1291981101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123292 + ... + 133359.

It is an arithmetic number, because the mean of its divisors is an integer number (161690760).

Almost surely, 2^1291981134 is an apocalyptic number.

1291981134 is an abundant number, since it is smaller than the sum of its proper divisors (1295071026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1291981134 is a wasteful number, since it uses less digits than its factorization.

1291981134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257495.

The product of its digits is 15552, while the sum is 39.

The square root of 1291981134 is about 35944.1390771848. The cubic root of 1291981134 is about 1089.1442190068.

The spelling of 1291981134 in words is "one billion, two hundred ninety-one million, nine hundred eighty-one thousand, one hundred thirty-four".