31132145 has 16 divisors (see below), whose sum is σ = 41084928. Its totient is φ = 22458240.

The previous prime is 31132141. The next prime is 31132159. The reversal of 31132145 is 54123113.

It is not a de Polignac number, because 31132145 - 2² = 31132141 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31132141) 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, 4757 + ... + 9213.

It is an arithmetic number, because the mean of its divisors is an integer number (2567808).

Almost surely, 2^31132145 is an apocalyptic number.

It is an amenable number.

31132145 is a deficient number, since it is larger than the sum of its proper divisors (9952783).

31132145 is a wasteful number, since it uses less digits than its factorization.

31132145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600.

The product of its digits is 360, while the sum is 20.

The square root of 31132145 is about 5579.6187145718. The cubic root of 31132145 is about 314.5837956613.

Adding to 31132145 its reverse (54123113), we get a palindrome (85255258).

The spelling of 31132145 in words is "thirty-one million, one hundred thirty-two thousand, one hundred forty-five".