31531045 has 48 divisors (see below), whose sum is σ = 49053312. Its totient is φ = 18944640.

The previous prime is 31531001. The next prime is 31531057. The reversal of 31531045 is 54013513.

It is a happy number.

It is not a de Polignac number, because 31531045 - 2¹¹ = 31528997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 240630 + ... + 240760.

It is an arithmetic number, because the mean of its divisors is an integer number (1021944).

Almost surely, 2^31531045 is an apocalyptic number.

31531045 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

31531045 is the 4585-th pentagonal number.

It is an amenable number.

31531045 is a deficient number, since it is larger than the sum of its proper divisors (17522267).

31531045 is a wasteful number, since it uses less digits than its factorization.

31531045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 31531045 is about 5615.2511074751. The cubic root of 31531045 is about 315.9216978719.

Adding to 31531045 its reverse (54013513), we get a palindrome (85544558).

The spelling of 31531045 in words is "thirty-one million, five hundred thirty-one thousand, forty-five".