61215133 has 4 divisors (see below), whose sum is σ = 69960160. Its totient is φ = 52470108.

The previous prime is 61215127. The next prime is 61215149. The reversal of 61215133 is 33151216.

It is a happy number.

61215133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61215133 - 2²⁵ = 27660701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61215533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4372503 + ... + 4372516.

It is an arithmetic number, because the mean of its divisors is an integer number (17490040).

Almost surely, 2^61215133 is an apocalyptic number.

It is an amenable number.

61215133 is a deficient number, since it is larger than the sum of its proper divisors (8745027).

61215133 is an equidigital number, since it uses as much as digits as its factorization.

61215133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8745026.

The product of its digits is 540, while the sum is 22.

The square root of 61215133 is about 7824.0100332247. The cubic root of 61215133 is about 394.1119460818. Note that the first 3 decimals are identical.

Adding to 61215133 its reverse (33151216), we get a palindrome (94366349).

The spelling of 61215133 in words is "sixty-one million, two hundred fifteen thousand, one hundred thirty-three".