63642261 has 4 divisors (see below), whose sum is σ = 84856352. Its totient is φ = 42428172.

The previous prime is 63642259. The next prime is 63642281. The reversal of 63642261 is 16224636.

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 not a de Polignac number, because 63642261 - 2¹ = 63642259 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 (63642251) 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, 10607041 + ... + 10607046.

It is an arithmetic number, because the mean of its divisors is an integer number (21214088).

Almost surely, 2^63642261 is an apocalyptic number.

It is an amenable number.

63642261 is a deficient number, since it is larger than the sum of its proper divisors (21214091).

63642261 is a wasteful number, since it uses less digits than its factorization.

63642261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21214090.

The product of its digits is 10368, while the sum is 30.

The square root of 63642261 is about 7977.6099804390. The cubic root of 63642261 is about 399.2533174469.

Adding to 63642261 its reverse (16224636), we get a palindrome (79866897).

It can be divided in two parts, 63642 and 261, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 63642261 in words is "sixty-three million, six hundred forty-two thousand, two hundred sixty-one".