1131981015 has 24 divisors (see below), whose sum is σ = 1990792944. Its totient is φ = 548838400.

The previous prime is 1131980999. The next prime is 1131981017. The reversal of 1131981015 is 5101891311.

1131981015 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1131981015 - 2⁴ = 1131980999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131981017) 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, 310026 + ... + 313655.

It is an arithmetic number, because the mean of its divisors is an integer number (82949706).

Almost surely, 2^1131981015 is an apocalyptic number.

1131981015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1131981015 is a deficient number, since it is larger than the sum of its proper divisors (858811929).

1131981015 is a wasteful number, since it uses less digits than its factorization.

1131981015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623711 (or 623700 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 30.

The square root of 1131981015 is about 33644.9255460612. The cubic root of 1131981015 is about 1042.1887505400.

The spelling of 1131981015 in words is "one billion, one hundred thirty-one million, nine hundred eighty-one thousand, fifteen".