31949145 has 12 divisors (see below), whose sum is σ = 55378596. Its totient is φ = 17039520.

The previous prime is 31949117. The next prime is 31949147. The reversal of 31949145 is 54194913.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4575321 + 27373824 = 2139^2 + 5232^2 .

It is not a de Polignac number, because 31949145 - 2¹⁰ = 31948121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31949147) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 354946 + ... + 355035.

It is an arithmetic number, because the mean of its divisors is an integer number (4614883).

Almost surely, 2^31949145 is an apocalyptic number.

It is an amenable number.

31949145 is a deficient number, since it is larger than the sum of its proper divisors (23429451).

31949145 is a wasteful number, since it uses less digits than its factorization.

31949145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709992 (or 709989 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 31949145 is about 5652.3574727719. The cubic root of 31949145 is about 317.3119393880.

The spelling of 31949145 in words is "thirty-one million, nine hundred forty-nine thousand, one hundred forty-five".