63861851 has 4 divisors (see below), whose sum is σ = 63922992. Its totient is φ = 63800712.

The previous prime is 63861841. The next prime is 63861859. The reversal of 63861851 is 15816836.

It is a happy number.

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 63861851 - 2²² = 59667547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63861859) 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, 28976 + ... + 31101.

It is an arithmetic number, because the mean of its divisors is an integer number (15980748).

Almost surely, 2^63861851 is an apocalyptic number.

63861851 is a deficient number, since it is larger than the sum of its proper divisors (61141).

63861851 is a wasteful number, since it uses less digits than its factorization.

63861851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61140.

The product of its digits is 34560, while the sum is 38.

The square root of 63861851 is about 7991.3610230048. The cubic root of 63861851 is about 399.7119822475.

The spelling of 63861851 in words is "sixty-three million, eight hundred sixty-one thousand, eight hundred fifty-one".