31330145 has 32 divisors (see below), whose sum is σ = 49351680. Its totient is φ = 18498240.

The previous prime is 31330141. The next prime is 31330151. The reversal of 31330145 is 54103313.

It is a happy number.

It is not a de Polignac number, because 31330145 - 2² = 31330141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31330141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5174 + ... + 9456.

It is an arithmetic number, because the mean of its divisors is an integer number (1542240).

Almost surely, 2^31330145 is an apocalyptic number.

31330145 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31330145 is a deficient number, since it is larger than the sum of its proper divisors (18021535).

31330145 is a wasteful number, since it uses less digits than its factorization.

31330145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 31330145 is about 5597.3337402731. Note that the first 3 decimals coincide. The cubic root of 31330145 is about 315.2493029341.

Adding to 31330145 its reverse (54103313), we get a palindrome (85433458).

The spelling of 31330145 in words is "thirty-one million, three hundred thirty thousand, one hundred forty-five".