1131523403 has 4 divisors (see below), whose sum is σ = 1148411880. Its totient is φ = 1114634928.

The previous prime is 1131523369. The next prime is 1131523411. The reversal of 1131523403 is 3043251311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1131523403 - 2¹² = 1131519307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131523423) 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, 8444138 + ... + 8444271.

It is an arithmetic number, because the mean of its divisors is an integer number (287102970).

Almost surely, 2^1131523403 is an apocalyptic number.

1131523403 is a deficient number, since it is larger than the sum of its proper divisors (16888477).

1131523403 is an equidigital number, since it uses as much as digits as its factorization.

1131523403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16888476.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1131523403 is about 33638.1242491314. The cubic root of 1131523403 is about 1042.0482940151.

Adding to 1131523403 its reverse (3043251311), we get a palindrome (4174774714).

The spelling of 1131523403 in words is "one billion, one hundred thirty-one million, five hundred twenty-three thousand, four hundred three".