1231161354 has 24 divisors (see below), whose sum is σ = 2807912640. Its totient is φ = 388787688.

The previous prime is 1231161341. The next prime is 1231161377. The reversal of 1231161354 is 4531611321.

It is a happy number.

1231161354 is a `hidden beast` number, since 12 + 31 + 1 + 613 + 5 + 4 = 666.

It is a super-2 number, since 2×1231161354² = 3031516559166226632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1799602 + ... + 1800285.

It is an arithmetic number, because the mean of its divisors is an integer number (116996360).

Almost surely, 2^1231161354 is an apocalyptic number.

1231161354 is an abundant number, since it is smaller than the sum of its proper divisors (1576751286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231161354 is a wasteful number, since it uses less digits than its factorization.

1231161354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599914 (or 3599911 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1231161354 is about 35087.9089431103. The cubic root of 1231161354 is about 1071.7783784127.

Adding to 1231161354 its reverse (4531611321), we get a palindrome (5762772675).

The spelling of 1231161354 in words is "one billion, two hundred thirty-one million, one hundred sixty-one thousand, three hundred fifty-four".