1131256385 has 24 divisors (see below), whose sum is σ = 1598196096. Its totient is φ = 766358880.

The previous prime is 1131256367. The next prime is 1131256387. The reversal of 1131256385 is 5836521311.

It is not a de Polignac number, because 1131256385 - 2⁸ = 1131256129 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is not an unprimeable number, because it can be changed into a prime (1131256387) 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, 7481 + ... + 48150.

It is an arithmetic number, because the mean of its divisors is an integer number (66591504).

Almost surely, 2^1131256385 is an apocalyptic number.

It is an amenable number.

1131256385 is a deficient number, since it is larger than the sum of its proper divisors (466939711).

1131256385 is an equidigital number, since it uses as much as digits as its factorization.

1131256385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55733 (or 55726 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 1131256385 is about 33634.1550362128. The cubic root of 1131256385 is about 1041.9663197079.

Adding to 1131256385 its reverse (5836521311), we get a palindrome (6967777696).

The spelling of 1131256385 in words is "one billion, one hundred thirty-one million, two hundred fifty-six thousand, three hundred eighty-five".