1156311431 has 8 divisors (see below), whose sum is σ = 1261907328. Its totient is φ = 1050795000.

The previous prime is 1156311427. The next prime is 1156311433. The reversal of 1156311431 is 1341136511.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1156311431 - 2² = 1156311427 is a prime.

It is a super-2 number, since 2×1156311431² = 2674112250922535522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1156311431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156311433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12926 + ... + 49796.

It is an arithmetic number, because the mean of its divisors is an integer number (157738416).

Almost surely, 2^1156311431 is an apocalyptic number.

1156311431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1156311431 is a deficient number, since it is larger than the sum of its proper divisors (105595897).

1156311431 is a wasteful number, since it uses less digits than its factorization.

1156311431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39733.

The product of its digits is 1080, while the sum is 26.

The square root of 1156311431 is about 34004.5795592300. The cubic root of 1156311431 is about 1049.6027010874.

Adding to 1156311431 its reverse (1341136511), we get a palindrome (2497447942).

The spelling of 1156311431 in words is "one billion, one hundred fifty-six million, three hundred eleven thousand, four hundred thirty-one".