161131245 has 16 divisors (see below), whose sum is σ = 281247552. Its totient is φ = 78124160.

The previous prime is 161131231. The next prime is 161131247. The reversal of 161131245 is 542131161.

It is a happy number.

It is not a de Polignac number, because 161131245 - 2⁵ = 161131213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161131247) 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, 488112 + ... + 488441.

It is an arithmetic number, because the mean of its divisors is an integer number (17577972).

Almost surely, 2^161131245 is an apocalyptic number.

161131245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161131245 is a deficient number, since it is larger than the sum of its proper divisors (120116307).

161131245 is a wasteful number, since it uses less digits than its factorization.

161131245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976572.

The product of its digits is 720, while the sum is 24.

The square root of 161131245 is about 12693.7482644017. The cubic root of 161131245 is about 544.1599661575.

The spelling of 161131245 in words is "one hundred sixty-one million, one hundred thirty-one thousand, two hundred forty-five".