31029290 has 8 divisors (see below), whose sum is σ = 55852740. Its totient is φ = 12411712.

The previous prime is 31029289. The next prime is 31029293. The reversal of 31029290 is 9292013.

It can be written as a sum of positive squares in 2 ways, for example, as 28654609 + 2374681 = 5353^2 + 1541^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31029293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551455 + ... + 1551474.

Almost surely, 2^31029290 is an apocalyptic number.

31029290 is a deficient number, since it is larger than the sum of its proper divisors (24823450).

31029290 is a wasteful number, since it uses less digits than its factorization.

31029290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3102936.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 31029290 is about 5570.3940614646. The cubic root of 31029290 is about 314.2369706972.

The spelling of 31029290 in words is "thirty-one million, twenty-nine thousand, two hundred ninety".