61853863 has 4 divisors (see below), whose sum is σ = 62168040. Its totient is φ = 61539688.

The previous prime is 61853821. The next prime is 61853879. The reversal of 61853863 is 36835816.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61853863 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 (61853263) 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, 156793 + ... + 157186.

It is an arithmetic number, because the mean of its divisors is an integer number (15542010).

Almost surely, 2^61853863 is an apocalyptic number.

61853863 is a deficient number, since it is larger than the sum of its proper divisors (314177).

61853863 is a wasteful number, since it uses less digits than its factorization.

61853863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314176.

The product of its digits is 103680, while the sum is 40.

The square root of 61853863 is about 7864.7226905976. The cubic root of 61853863 is about 395.4779515935.

The spelling of 61853863 in words is "sixty-one million, eight hundred fifty-three thousand, eight hundred sixty-three".