61213930 has 24 divisors (see below), whose sum is σ = 111458052. Its totient is φ = 24205824.

The previous prime is 61213921. The next prime is 61213961. The reversal of 61213930 is 3931216.

61213930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 56535361 + 4678569 = 7519^2 + 2163^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61213895 and 61213904.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 105802 + ... + 106378.

Almost surely, 2^61213930 is an apocalyptic number.

61213930 is a deficient number, since it is larger than the sum of its proper divisors (50244122).

61213930 is a wasteful number, since it uses less digits than its factorization.

61213930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 61213930 is about 7823.9331541112. The cubic root of 61213930 is about 394.1093643685.

The spelling of 61213930 in words is "sixty-one million, two hundred thirteen thousand, nine hundred thirty".