1131431506 has 8 divisors (see below), whose sum is σ = 1697574384. Its totient is φ = 565573380.

The previous prime is 1131431467. The next prime is 1131431507. The reversal of 1131431506 is 6051341311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1131431507) 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, 60960 + ... + 77323.

It is an arithmetic number, because the mean of its divisors is an integer number (212196798).

Almost surely, 2^1131431506 is an apocalyptic number.

1131431506 is a deficient number, since it is larger than the sum of its proper divisors (566142878).

1131431506 is a wasteful number, since it uses less digits than its factorization.

1131431506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142376.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1131431506 is about 33636.7582564075. The cubic root of 1131431506 is about 1042.0200831670.

Adding to 1131431506 its reverse (6051341311), we get a palindrome (7182772817).

The spelling of 1131431506 in words is "one billion, one hundred thirty-one million, four hundred thirty-one thousand, five hundred six".