63121391 has 8 divisors (see below), whose sum is σ = 66906000. Its totient is φ = 59344768.

The previous prime is 63121351. The next prime is 63121451. The reversal of 63121391 is 19312136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63121391 - 2¹⁰ = 63120367 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63121391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63121321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24245 + ... + 26721.

It is an arithmetic number, because the mean of its divisors is an integer number (8363250).

Almost surely, 2^63121391 is an apocalyptic number.

63121391 is a deficient number, since it is larger than the sum of its proper divisors (3784609).

63121391 is a wasteful number, since it uses less digits than its factorization.

63121391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993.

The product of its digits is 972, while the sum is 26.

The square root of 63121391 is about 7944.8971673647. The cubic root of 63121391 is about 398.1611238742.

It can be divided in two parts, 631 and 21391, that added together give a palindrome (22022).

The spelling of 63121391 in words is "sixty-three million, one hundred twenty-one thousand, three hundred ninety-one".