1131254657 has 16 divisors (see below), whose sum is σ = 1250076240. Its totient is φ = 1017062400.

The previous prime is 1131254653. The next prime is 1131254669. The reversal of 1131254657 is 7564521311.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 558896881 + 572357776 = 23641^2 + 23924^2 .

It is not a de Polignac number, because 1131254657 - 2² = 1131254653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131254651) 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, 404219 + ... + 407007.

It is an arithmetic number, because the mean of its divisors is an integer number (78129765).

Almost surely, 2^1131254657 is an apocalyptic number.

It is an amenable number.

1131254657 is a deficient number, since it is larger than the sum of its proper divisors (118821583).

1131254657 is a wasteful number, since it uses less digits than its factorization.

1131254657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3604.

The product of its digits is 25200, while the sum is 35.

The square root of 1131254657 is about 33634.1293480298. The cubic root of 1131254657 is about 1041.9657891713.

Adding to 1131254657 its reverse (7564521311), we get a palindrome (8695775968).

The spelling of 1131254657 in words is "one billion, one hundred thirty-one million, two hundred fifty-four thousand, six hundred fifty-seven".