31040245 has 8 divisors (see below), whose sum is σ = 37951416. Its totient is φ = 24363456.

The previous prime is 31040231. The next prime is 31040293. The reversal of 31040245 is 54204013.

It can be written as a sum of positive squares in 4 ways, for example, as 15689521 + 15350724 = 3961^2 + 3918^2 .

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 31040245 - 2⁷ = 31040117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58302 + ... + 58831.

It is an arithmetic number, because the mean of its divisors is an integer number (4743927).

Almost surely, 2^31040245 is an apocalyptic number.

It is an amenable number.

31040245 is a deficient number, since it is larger than the sum of its proper divisors (6911171).

31040245 is a wasteful number, since it uses less digits than its factorization.

31040245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117191.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 31040245 is about 5571.3772982989. The cubic root of 31040245 is about 314.2739471686.

Adding to 31040245 its reverse (54204013), we get a palindrome (85244258).

The spelling of 31040245 in words is "thirty-one million, forty thousand, two hundred forty-five".