1137145991 has 4 divisors (see below), whose sum is σ = 1196995800. Its totient is φ = 1077296184.

The previous prime is 1137145981. The next prime is 1137145993. The reversal of 1137145991 is 1995417311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1995417311 = 9511 ⋅209801.

It is a cyclic number.

It is not a de Polignac number, because 1137145991 - 2¹⁴ = 1137129607 is a prime.

It is a super-3 number, since 3×1137145991³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1137145993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29924876 + ... + 29924913.

It is an arithmetic number, because the mean of its divisors is an integer number (299248950).

Almost surely, 2^1137145991 is an apocalyptic number.

1137145991 is a deficient number, since it is larger than the sum of its proper divisors (59849809).

1137145991 is an equidigital number, since it uses as much as digits as its factorization.

1137145991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59849808.

The product of its digits is 34020, while the sum is 41.

The square root of 1137145991 is about 33721.5953210995. The cubic root of 1137145991 is about 1043.7714371588.

The spelling of 1137145991 in words is "one billion, one hundred thirty-seven million, one hundred forty-five thousand, nine hundred ninety-one".