31232145 has 32 divisors (see below), whose sum is σ = 60473088. Its totient is φ = 13436928.

The previous prime is 31232141. The next prime is 31232171. The reversal of 31232145 is 54123213.

It is not a de Polignac number, because 31232145 - 2² = 31232141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31232141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6964 + ... + 10533.

It is an arithmetic number, because the mean of its divisors is an integer number (1889784).

Almost surely, 2^31232145 is an apocalyptic number.

31232145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31232145 is a deficient number, since it is larger than the sum of its proper divisors (29240943).

31232145 is a wasteful number, since it uses less digits than its factorization.

31232145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17529.

The product of its digits is 720, while the sum is 21.

The square root of 31232145 is about 5588.5727158193. The cubic root of 31232145 is about 314.9202620041.

Adding to 31232145 its reverse (54123213), we get a palindrome (85355358).

The spelling of 31232145 in words is "thirty-one million, two hundred thirty-two thousand, one hundred forty-five".