61221823 has 4 divisors (see below), whose sum is σ = 65931208. Its totient is φ = 56512440.

The previous prime is 61221821. The next prime is 61221833. The reversal of 61221823 is 32812216.

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

It is a cyclic number.

It is not a de Polignac number, because 61221823 - 2¹ = 61221821 is a prime.

It is a super-2 number, since 2×61221823² = 7496223222886658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61221821) 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, 2354673 + ... + 2354698.

It is an arithmetic number, because the mean of its divisors is an integer number (16482802).

Almost surely, 2^61221823 is an apocalyptic number.

61221823 is a deficient number, since it is larger than the sum of its proper divisors (4709385).

61221823 is a wasteful number, since it uses less digits than its factorization.

61221823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4709384.

The product of its digits is 1152, while the sum is 25.

The square root of 61221823 is about 7824.4375516710. The cubic root of 61221823 is about 394.1263026238.

The spelling of 61221823 in words is "sixty-one million, two hundred twenty-one thousand, eight hundred twenty-three".