31427245 has 16 divisors (see below), whose sum is σ = 38941488. Its totient is φ = 24330240.

The previous prime is 31427243. The next prime is 31427267. The reversal of 31427245 is 54272413.

It can be written as a sum of positive squares in 8 ways, for example, as 11329956 + 20097289 = 3366^2 + 4483^2 .

It is not a de Polignac number, because 31427245 - 2¹ = 31427243 is a prime.

It is a Duffinian number.

Its product of digits (6720) is a multiple of the sum of its prime divisors (960).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31427243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47215 + ... + 47875.

It is an arithmetic number, because the mean of its divisors is an integer number (2433843).

Almost surely, 2^31427245 is an apocalyptic number.

It is an amenable number.

31427245 is a deficient number, since it is larger than the sum of its proper divisors (7514243).

31427245 is a wasteful number, since it uses less digits than its factorization.

31427245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its digits is 6720, while the sum is 28.

The square root of 31427245 is about 5606.0008027113. Note that the first 3 decimals coincide. The cubic root of 31427245 is about 315.5746460206.

Adding to 31427245 its reverse (54272413), we get a palindrome (85699658).

The spelling of 31427245 in words is "thirty-one million, four hundred twenty-seven thousand, two hundred forty-five".