63121281 has 4 divisors (see below), whose sum is σ = 84161712. Its totient is φ = 42080852.

The previous prime is 63121277. The next prime is 63121309. The reversal of 63121281 is 18212136.

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 a cyclic number.

It is not a de Polignac number, because 63121281 - 2² = 63121277 is a prime.

It is a super-2 number, since 2×63121281² = 7968592230161922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (63121231) 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, 10520211 + ... + 10520216.

It is an arithmetic number, because the mean of its divisors is an integer number (21040428).

Almost surely, 2^63121281 is an apocalyptic number.

It is an amenable number.

63121281 is a deficient number, since it is larger than the sum of its proper divisors (21040431).

63121281 is a wasteful number, since it uses less digits than its factorization.

63121281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21040430.

The product of its digits is 576, while the sum is 24.

The square root of 63121281 is about 7944.8902446793. The cubic root of 63121281 is about 398.1608925857.

It can be divided in two parts, 631 and 21281, that added together give a palindrome (21912).

The spelling of 63121281 in words is "sixty-three million, one hundred twenty-one thousand, two hundred eighty-one".