31261345 has 16 divisors (see below), whose sum is σ = 38631168. Its totient is φ = 24273280.

The previous prime is 31261343. The next prime is 31261367. The reversal of 31261345 is 54316213.

It is not a de Polignac number, because 31261345 - 2¹ = 31261343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31261343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31710 + ... + 32680.

It is an arithmetic number, because the mean of its divisors is an integer number (2414448).

Almost surely, 2^31261345 is an apocalyptic number.

It is an amenable number.

31261345 is a deficient number, since it is larger than the sum of its proper divisors (7369823).

31261345 is a wasteful number, since it uses less digits than its factorization.

31261345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its digits is 2160, while the sum is 25.

The square root of 31261345 is about 5591.1845793177. The cubic root of 31261345 is about 315.0183746735.

Adding to 31261345 its reverse (54316213), we get a palindrome (85577558).

The spelling of 31261345 in words is "thirty-one million, two hundred sixty-one thousand, three hundred forty-five".