31427145 has 24 divisors (see below), whose sum is σ = 55505736. Its totient is φ = 16443648.

The previous prime is 31427129. The next prime is 31427147. The reversal of 31427145 is 54172413.

It can be written as a sum of positive squares in 4 ways, for example, as 7485696 + 23941449 = 2736^2 + 4893^2 .

It is not a de Polignac number, because 31427145 - 2⁴ = 31427129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31427147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4204 + ... + 8973.

It is an arithmetic number, because the mean of its divisors is an integer number (2312739).

Almost surely, 2^31427145 is an apocalyptic number.

It is an amenable number.

31427145 is a deficient number, since it is larger than the sum of its proper divisors (24078591).

31427145 is a wasteful number, since it uses less digits than its factorization.

31427145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13241 (or 13238 counting only the distinct ones).

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

The square root of 31427145 is about 5605.9918836902. The cubic root of 31427145 is about 315.5743113057.

Adding to 31427145 its reverse (54172413), we get a palindrome (85599558).

The spelling of 31427145 in words is "thirty-one million, four hundred twenty-seven thousand, one hundred forty-five".