63405121 has 16 divisors (see below), whose sum is σ = 72627408. Its totient is φ = 54835200.

The previous prime is 63405101. The next prime is 63405127. The reversal of 63405121 is 12150436.

It can be written as a sum of positive squares in 8 ways, for example, as 440896 + 62964225 = 664^2 + 7935^2 .

It is not a de Polignac number, because 63405121 - 2⁷ = 63404993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63405092 and 63405101.

It is not an unprimeable number, because it can be changed into a prime (63405127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61591 + ... + 62611.

It is an arithmetic number, because the mean of its divisors is an integer number (4539213).

Almost surely, 2^63405121 is an apocalyptic number.

It is an amenable number.

63405121 is a deficient number, since it is larger than the sum of its proper divisors (9222287).

63405121 is a wasteful number, since it uses less digits than its factorization.

63405121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1332.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 63405121 is about 7962.7332618894. The cubic root of 63405121 is about 398.7568089429.

Adding to 63405121 its reverse (12150436), we get a palindrome (75555557).

The spelling of 63405121 in words is "sixty-three million, four hundred five thousand, one hundred twenty-one".