61433821 has 4 divisors (see below), whose sum is σ = 64667200. Its totient is φ = 58200444.

The previous prime is 61433773. The next prime is 61433833. The reversal of 61433821 is 12833416.

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 a de Polignac number, because none of the positive numbers 2^k-61433821 is a prime.

It is a super-2 number, since 2×61433821² = 7548228725320082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61433821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61433881) 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, 1616661 + ... + 1616698.

It is an arithmetic number, because the mean of its divisors is an integer number (16166800).

Almost surely, 2^61433821 is an apocalyptic number.

It is an amenable number.

61433821 is a deficient number, since it is larger than the sum of its proper divisors (3233379).

61433821 is a wasteful number, since it uses less digits than its factorization.

61433821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233378.

The product of its digits is 3456, while the sum is 28.

The square root of 61433821 is about 7837.9730160291. The cubic root of 61433821 is about 394.5807033900.

The spelling of 61433821 in words is "sixty-one million, four hundred thirty-three thousand, eight hundred twenty-one".