31730146 has 48 divisors (see below), whose sum is σ = 58174200. Its totient is φ = 12929280.

The previous prime is 31730137. The next prime is 31730197. The reversal of 31730146 is 64103713.

It can be written as a sum of positive squares in 4 ways, for example, as 16088121 + 15642025 = 4011^2 + 3955^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31730146.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212880 + ... + 213028.

Almost surely, 2^31730146 is an apocalyptic number.

31730146 is a deficient number, since it is larger than the sum of its proper divisors (26444054).

31730146 is a wasteful number, since it uses less digits than its factorization.

31730146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 31730146 is about 5632.9518016756. The cubic root of 31730146 is about 316.5852597143.

Adding to 31730146 its reverse (64103713), we get a palindrome (95833859).

The spelling of 31730146 in words is "thirty-one million, seven hundred thirty thousand, one hundred forty-six".