1131431377 has 8 divisors (see below), whose sum is σ = 1162476000. Its totient is φ = 1100782464.

The previous prime is 1131431359. The next prime is 1131431383. The reversal of 1131431377 is 7731341311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131431377 is a prime.

It is a super-2 number, since 2×1131431377² = 2560273921720232258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131431677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93127 + ... + 104572.

It is an arithmetic number, because the mean of its divisors is an integer number (145309500).

Almost surely, 2^1131431377 is an apocalyptic number.

It is an amenable number.

1131431377 is a deficient number, since it is larger than the sum of its proper divisors (31044623).

1131431377 is an equidigital number, since it uses as much as digits as its factorization.

1131431377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197855.

The product of its digits is 5292, while the sum is 31.

The square root of 1131431377 is about 33636.7563388624. The cubic root of 1131431377 is about 1042.0200435651.

Adding to 1131431377 its reverse (7731341311), we get a palindrome (8862772688).

The spelling of 1131431377 in words is "one billion, one hundred thirty-one million, four hundred thirty-one thousand, three hundred seventy-seven".