31649145 has 32 divisors (see below), whose sum is σ = 55931904. Its totient is φ = 15153600.

The previous prime is 31649141. The next prime is 31649183. The reversal of 31649145 is 54194613.

It is not a de Polignac number, because 31649145 - 2² = 31649141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (31649141) 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, 12540 + ... + 14850.

It is an arithmetic number, because the mean of its divisors is an integer number (1747872).

Almost surely, 2^31649145 is an apocalyptic number.

It is an amenable number.

31649145 is a deficient number, since it is larger than the sum of its proper divisors (24282759).

31649145 is a wasteful number, since it uses less digits than its factorization.

31649145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413.

The product of its digits is 12960, while the sum is 33.

The square root of 31649145 is about 5625.7572823576. The cubic root of 31649145 is about 316.3156362591.

The spelling of 31649145 in words is "thirty-one million, six hundred forty-nine thousand, one hundred forty-five".