61213133 has 8 divisors (see below), whose sum is σ = 62969952. Its totient is φ = 59461776.

The previous prime is 61213091. The next prime is 61213151. The reversal of 61213133 is 33131216.

It is a happy number.

61213133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61213133 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 (61213153) 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 7 ways as a sum of consecutive naturals, for example, 34166 + ... + 35912.

It is an arithmetic number, because the mean of its divisors is an integer number (7871244).

Almost surely, 2^61213133 is an apocalyptic number.

It is an amenable number.

61213133 is a deficient number, since it is larger than the sum of its proper divisors (1756819).

61213133 is a wasteful number, since it uses less digits than its factorization.

61213133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2731.

The product of its digits is 324, while the sum is 20.

The square root of 61213133 is about 7823.8822204836. The cubic root of 61213133 is about 394.1076539379.

Adding to 61213133 its reverse (33131216), we get a palindrome (94344349).

The spelling of 61213133 in words is "sixty-one million, two hundred thirteen thousand, one hundred thirty-three".