1131431505 has 32 divisors (see below), whose sum is σ = 1849236480. Its totient is φ = 590573760.

The previous prime is 1131431467. The next prime is 1131431507. The reversal of 1131431505 is 5051341311.

It is not a de Polignac number, because 1131431505 - 2¹¹ = 1131429457 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 144214 + ... + 151856.

It is an arithmetic number, because the mean of its divisors is an integer number (57788640).

Almost surely, 2^1131431505 is an apocalyptic number.

1131431505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131431505 is a deficient number, since it is larger than the sum of its proper divisors (717804975).

1131431505 is a wasteful number, since it uses less digits than its factorization.

1131431505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 1131431505 is about 33636.7582415428. The cubic root of 1131431505 is about 1042.0200828600.

Adding to 1131431505 its reverse (5051341311), we get a palindrome (6182772816).

The spelling of 1131431505 in words is "one billion, one hundred thirty-one million, four hundred thirty-one thousand, five hundred five".