61818023 has 4 divisors (see below), whose sum is σ = 61851240. Its totient is φ = 61784808.

The previous prime is 61818011. The next prime is 61818059. The reversal of 61818023 is 32081816.

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 61818023 - 2⁴ = 61818007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61811023) 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, 13640 + ... + 17597.

It is an arithmetic number, because the mean of its divisors is an integer number (15462810).

Almost surely, 2^61818023 is an apocalyptic number.

61818023 is a deficient number, since it is larger than the sum of its proper divisors (33217).

61818023 is a wasteful number, since it uses less digits than its factorization.

61818023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33216.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 61818023 is about 7862.4438312779. The cubic root of 61818023 is about 395.4015528714.

Adding to 61818023 its reverse (32081816), we get a palindrome (93899839).

The spelling of 61818023 in words is "sixty-one million, eight hundred eighteen thousand, twenty-three".