31020245 has 8 divisors (see below), whose sum is σ = 38230584. Its totient is φ = 24145344.

The previous prime is 31020233. The next prime is 31020247. The reversal of 31020245 is 54202013.

It can be written as a sum of positive squares in 4 ways, for example, as 4218916 + 26801329 = 2054^2 + 5177^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 31020245 - 2²⁴ = 14243029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020247) 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, 83654 + ... + 84023.

It is an arithmetic number, because the mean of its divisors is an integer number (4778823).

Almost surely, 2^31020245 is an apocalyptic number.

It is an amenable number.

31020245 is a deficient number, since it is larger than the sum of its proper divisors (7210339).

31020245 is a wasteful number, since it uses less digits than its factorization.

31020245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167719.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 31020245 is about 5569.5821207699. The cubic root of 31020245 is about 314.2064344993.

Adding to 31020245 its reverse (54202013), we get a palindrome (85222258).

The spelling of 31020245 in words is "thirty-one million, twenty thousand, two hundred forty-five".