31742145 has 32 divisors (see below), whose sum is σ = 59754240. Its totient is φ = 15932160.

The previous prime is 31742107. The next prime is 31742147. The reversal of 31742145 is 54124713.

It is not a de Polignac number, because 31742145 - 2⁷ = 31742017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31742147) 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 31 ways as a sum of consecutive naturals, for example, 4621 + ... + 9210.

It is an arithmetic number, because the mean of its divisors is an integer number (1867320).

Almost surely, 2^31742145 is an apocalyptic number.

It is an amenable number.

31742145 is a deficient number, since it is larger than the sum of its proper divisors (28012095).

31742145 is a wasteful number, since it uses less digits than its factorization.

31742145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13862 (or 13856 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 31742145 is about 5634.0167731380. The cubic root of 31742145 is about 316.6251610729.

Adding to 31742145 its reverse (54124713), we get a palindrome (85866858).

The spelling of 31742145 in words is "thirty-one million, seven hundred forty-two thousand, one hundred forty-five".