61213533 has 8 divisors (see below), whose sum is σ = 83608896. Its totient is φ = 39813600.

The previous prime is 61213531. The next prime is 61213543. The reversal of 61213533 is 33531216.

It is a happy number.

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

It is not a de Polignac number, because 61213533 - 2¹ = 61213531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61213531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248713 + ... + 248958.

It is an arithmetic number, because the mean of its divisors is an integer number (10451112).

Almost surely, 2^61213533 is an apocalyptic number.

It is an amenable number.

61213533 is a deficient number, since it is larger than the sum of its proper divisors (22395363).

61213533 is a wasteful number, since it uses less digits than its factorization.

61213533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497715.

The product of its digits is 1620, while the sum is 24.

The square root of 61213533 is about 7823.9077831989. The cubic root of 61213533 is about 394.1085123742.

Adding to 61213533 its reverse (33531216), we get a palindrome (94744749).

The spelling of 61213533 in words is "sixty-one million, two hundred thirteen thousand, five hundred thirty-three".