61642133 has 4 divisors (see below), whose sum is σ = 70448160. Its totient is φ = 52836108.

The previous prime is 61642109. The next prime is 61642151. The reversal of 61642133 is 33124616.

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 61642133 - 2⁶ = 61642069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61642103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4403003 + ... + 4403016.

It is an arithmetic number, because the mean of its divisors is an integer number (17612040).

Almost surely, 2^61642133 is an apocalyptic number.

It is an amenable number.

61642133 is a deficient number, since it is larger than the sum of its proper divisors (8806027).

61642133 is an equidigital number, since it uses as much as digits as its factorization.

61642133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8806026.

The product of its digits is 2592, while the sum is 26.

The square root of 61642133 is about 7851.2504099666. The cubic root of 61642133 is about 395.0261863748.

Adding to 61642133 its reverse (33124616), we get a palindrome (94766749).

The spelling of 61642133 in words is "sixty-one million, six hundred forty-two thousand, one hundred thirty-three".