63115551 has 8 divisors (see below), whose sum is σ = 93504560. Its totient is φ = 42077016.

The previous prime is 63115537. The next prime is 63115553. The reversal of 63115551 is 15551136.

63115551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 63115551 - 2⁶ = 63115487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2337613 = 63115551 / (6 + 3 + 1 + 1 + 5 + 5 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63115553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1168780 + ... + 1168833.

It is an arithmetic number, because the mean of its divisors is an integer number (11688070).

Almost surely, 2^63115551 is an apocalyptic number.

63115551 is a deficient number, since it is larger than the sum of its proper divisors (30389009).

63115551 is a wasteful number, since it uses less digits than its factorization.

63115551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337622 (or 2337616 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 63115551 is about 7944.5296273599. The cubic root of 63115551 is about 398.1488441877.

Adding to 63115551 its reverse (15551136), we get a palindrome (78666687).

The spelling of 63115551 in words is "sixty-three million, one hundred fifteen thousand, five hundred fifty-one".