61421533 has 4 divisors (see below), whose sum is σ = 61480060. Its totient is φ = 61363008.

The previous prime is 61421453. The next prime is 61421573. The reversal of 61421533 is 33512416.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37185604 + 24235929 = 6098^2 + 4923^2 .

It is a cyclic number.

It is not a de Polignac number, because 61421533 - 2²¹ = 59324381 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61421498 and 61421507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61421573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27660 + ... + 29797.

It is an arithmetic number, because the mean of its divisors is an integer number (15370015).

Almost surely, 2^61421533 is an apocalyptic number.

It is an amenable number.

61421533 is a deficient number, since it is larger than the sum of its proper divisors (58527).

61421533 is a wasteful number, since it uses less digits than its factorization.

61421533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58526.

The product of its digits is 2160, while the sum is 25.

The square root of 61421533 is about 7837.1891006917. The cubic root of 61421533 is about 394.5543936098.

Adding to 61421533 its reverse (33512416), we get a palindrome (94933949).

The spelling of 61421533 in words is "sixty-one million, four hundred twenty-one thousand, five hundred thirty-three".