31380530 has 16 divisors (see below), whose sum is σ = 56548800. Its totient is φ = 12538032.

The previous prime is 31380529. The next prime is 31380541. The reversal of 31380530 is 3508313.

It is a junction number, because it is equal to n+sod(n) for n = 31380496 and 31380505.

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, 16067 + ... + 17913.

It is an arithmetic number, because the mean of its divisors is an integer number (3534300).

Almost surely, 2^31380530 is an apocalyptic number.

31380530 is a deficient number, since it is larger than the sum of its proper divisors (25168270).

31380530 is a wasteful number, since it uses less digits than its factorization.

31380530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 31380530 is about 5601.8327358107. The cubic root of 31380530 is about 315.4182065992.

Adding to 31380530 its reverse (3508313), we get a palindrome (34888843).

The spelling of 31380530 in words is "thirty-one million, three hundred eighty thousand, five hundred thirty".