1163121431 has 16 divisors (see below), whose sum is σ = 1225801728. Its totient is φ = 1101513600.

The previous prime is 1163121403. The next prime is 1163121437. The reversal of 1163121431 is 1341213611.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1163121431 - 2⁶ = 1163121367 is a prime.

It is a super-2 number, since 2×1163121431² = 2705702926502975522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1163121397 and 1163121406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1163121437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1190015 + ... + 1190991.

It is an arithmetic number, because the mean of its divisors is an integer number (76612608).

Almost surely, 2^1163121431 is an apocalyptic number.

1163121431 is a deficient number, since it is larger than the sum of its proper divisors (62680297).

1163121431 is a wasteful number, since it uses less digits than its factorization.

1163121431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462.

The product of its digits is 432, while the sum is 23.

The square root of 1163121431 is about 34104.5661312382. The cubic root of 1163121431 is about 1051.6591851284.

The spelling of 1163121431 in words is "one billion, one hundred sixty-three million, one hundred twenty-one thousand, four hundred thirty-one".