31620145 has 8 divisors (see below), whose sum is σ = 38424960. Its totient is φ = 24975600.

The previous prime is 31620139. The next prime is 31620151. The reversal of 31620145 is 54102613.

It is an interprime number because it is at equal distance from previous prime (31620139) and next prime (31620151).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-31620145 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39631 + ... + 40420.

It is an arithmetic number, because the mean of its divisors is an integer number (4803120).

Almost surely, 2^31620145 is an apocalyptic number.

It is an amenable number.

31620145 is a deficient number, since it is larger than the sum of its proper divisors (6804815).

31620145 is an equidigital number, since it uses as much as digits as its factorization.

31620145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80135.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 31620145 is about 5623.1792608808. The cubic root of 31620145 is about 316.2189937679.

Adding to 31620145 its reverse (54102613), we get a palindrome (85722758).

The spelling of 31620145 in words is "thirty-one million, six hundred twenty thousand, one hundred forty-five".