61213975 has 24 divisors (see below), whose sum is σ = 78923520. Its totient is φ = 47063520.

The previous prime is 61213963. The next prime is 61213981. The reversal of 61213975 is 57931216.

61213975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61213975 - 2⁷ = 61213847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61213975.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 68884 + ... + 69766.

It is an arithmetic number, because the mean of its divisors is an integer number (3288480).

Almost surely, 2^61213975 is an apocalyptic number.

61213975 is a deficient number, since it is larger than the sum of its proper divisors (17709545).

61213975 is a wasteful number, since it uses less digits than its factorization.

61213975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999 (or 994 counting only the distinct ones).

The product of its digits is 11340, while the sum is 34.

The square root of 61213975 is about 7823.9360299021. The cubic root of 61213975 is about 394.1094609419.

The spelling of 61213975 in words is "sixty-one million, two hundred thirteen thousand, nine hundred seventy-five".