31012385 has 8 divisors (see below), whose sum is σ = 37245096. Its totient is φ = 24789760.

The previous prime is 31012381. The next prime is 31012391. The reversal of 31012385 is 58321013.

It can be written as a sum of positive squares in 4 ways, for example, as 4376464 + 26635921 = 2092^2 + 5161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31012385 - 2² = 31012381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31012385.

It is not an unprimeable number, because it can be changed into a prime (31012381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9257 + ... + 12153.

It is an arithmetic number, because the mean of its divisors is an integer number (4655637).

Almost surely, 2^31012385 is an apocalyptic number.

It is an amenable number.

31012385 is a deficient number, since it is larger than the sum of its proper divisors (6232711).

31012385 is a wasteful number, since it uses less digits than its factorization.

31012385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5043.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 31012385 is about 5568.8764575990. The cubic root of 31012385 is about 314.1798940771.

Adding to 31012385 its reverse (58321013), we get a palindrome (89333398).

The spelling of 31012385 in words is "thirty-one million, twelve thousand, three hundred eighty-five".