63121771 has 4 divisors (see below), whose sum is σ = 63323752. Its totient is φ = 62919792.

The previous prime is 63121757. The next prime is 63121783. The reversal of 63121771 is 17712136.

63121771 = 3241² + 3242² + ... + 3246².

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63121771 - 2⁹ = 63121259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63121271) 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, 100521 + ... + 101146.

It is an arithmetic number, because the mean of its divisors is an integer number (15830938).

Almost surely, 2^63121771 is an apocalyptic number.

63121771 is a deficient number, since it is larger than the sum of its proper divisors (201981).

63121771 is a wasteful number, since it uses less digits than its factorization.

63121771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201980.

The product of its digits is 1764, while the sum is 28.

The square root of 63121771 is about 7944.9210820498. The cubic root of 63121771 is about 398.1619228686.

The spelling of 63121771 in words is "sixty-three million, one hundred twenty-one thousand, seven hundred seventy-one".