1137991681 has 8 divisors (see below), whose sum is σ = 1210237280. Its totient is φ = 1066981248.

The previous prime is 1137991667. The next prime is 1137991693. The reversal of 1137991681 is 1861997311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1137991681 - 2⁷ = 1137991553 is a prime.

It is a super-2 number, since 2×1137991681² = 2590050132050411522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1137991081) 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, 306891 + ... + 310576.

It is an arithmetic number, because the mean of its divisors is an integer number (151279660).

Almost surely, 2^1137991681 is an apocalyptic number.

It is an amenable number.

1137991681 is a deficient number, since it is larger than the sum of its proper divisors (72245599).

1137991681 is an equidigital number, since it uses as much as digits as its factorization.

1137991681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617583.

The product of its digits is 81648, while the sum is 46.

The square root of 1137991681 is about 33734.1322846757. The cubic root of 1137991681 is about 1044.0301223063.

The spelling of 1137991681 in words is "one billion, one hundred thirty-seven million, nine hundred ninety-one thousand, six hundred eighty-one".