1161523231 has 8 divisors (see below), whose sum is σ = 1267508304. Its totient is φ = 1055603520.

The previous prime is 1161523217. The next prime is 1161523241. The reversal of 1161523231 is 1323251611.

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 1161523231 - 2¹³ = 1161515039 is a prime.

It is a super-2 number, since 2×1161523231² = 2698272432305358722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1161523196 and 1161523205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161523201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25491 + ... + 54523.

It is an arithmetic number, because the mean of its divisors is an integer number (158438538).

Almost surely, 2^1161523231 is an apocalyptic number.

1161523231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1161523231 is a deficient number, since it is larger than the sum of its proper divisors (105985073).

1161523231 is a wasteful number, since it uses less digits than its factorization.

1161523231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32681.

The product of its digits is 1080, while the sum is 25.

The square root of 1161523231 is about 34081.1271967346. The cubic root of 1161523231 is about 1051.1772829881.

Adding to 1161523231 its reverse (1323251611), we get a palindrome (2484774842).

It can be divided in two parts, 11615 and 23231, that multiplied together give a triangular number (269828065 = T₂₃₂₃₀).

The spelling of 1161523231 in words is "one billion, one hundred sixty-one million, five hundred twenty-three thousand, two hundred thirty-one".