31138330 has 8 divisors (see below), whose sum is σ = 56049012. Its totient is φ = 12455328.

The previous prime is 31138313. The next prime is 31138381. The reversal of 31138330 is 3383113.

It can be written as a sum of positive squares in 2 ways, for example, as 27029601 + 4108729 = 5199^2 + 2027^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556907 + ... + 1556926.

Almost surely, 2^31138330 is an apocalyptic number.

31138330 is a deficient number, since it is larger than the sum of its proper divisors (24910682).

31138330 is a wasteful number, since it uses less digits than its factorization.

31138330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113840.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 31138330 is about 5580.1729363883. The cubic root of 31138330 is about 314.6046269911.

The spelling of 31138330 in words is "thirty-one million, one hundred thirty-eight thousand, three hundred thirty".