1131081765 has 16 divisors (see below), whose sum is σ = 1974252096. Its totient is φ = 548403200.

The previous prime is 1131081709. The next prime is 1131081769. The reversal of 1131081765 is 5671801311.

It is not a de Polignac number, because 1131081765 - 2¹⁴ = 1131065381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131081769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3427356 + ... + 3427685.

It is an arithmetic number, because the mean of its divisors is an integer number (123390756).

Almost surely, 2^1131081765 is an apocalyptic number.

1131081765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131081765 is a deficient number, since it is larger than the sum of its proper divisors (843170331).

1131081765 is a wasteful number, since it uses less digits than its factorization.

1131081765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6855060.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 1131081765 is about 33631.5590628802. The cubic root of 1131081765 is about 1041.9127045346.

The spelling of 1131081765 in words is "one billion, one hundred thirty-one million, eighty-one thousand, seven hundred sixty-five".