31550145 has 24 divisors (see below), whose sum is σ = 55489728. Its totient is φ = 15296160.

The previous prime is 31550137. The next prime is 31550149. The reversal of 31550145 is 54105513.

It is not a de Polignac number, because 31550145 - 2³ = 31550137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31550149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6877 + ... + 10506.

It is an arithmetic number, because the mean of its divisors is an integer number (2312072).

Almost surely, 2^31550145 is an apocalyptic number.

It is an amenable number.

31550145 is a deficient number, since it is larger than the sum of its proper divisors (23939583).

31550145 is a wasteful number, since it uses less digits than its factorization.

31550145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17413 (or 17402 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 31550145 is about 5616.9515753654. The cubic root of 31550145 is about 315.9854750841.

Adding to 31550145 its reverse (54105513), we get a palindrome (85655658).

The spelling of 31550145 in words is "thirty-one million, five hundred fifty thousand, one hundred forty-five".