421516877 has 2 divisors, whose sum is σ = 421516878. Its totient is φ = 421516876.

The previous prime is 421516873. The next prime is 421516939. The reversal of 421516877 is 778615124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237344836 + 184172041 = 15406^2 + 13571^2 .

It is a cyclic number.

It is not a de Polignac number, because 421516877 - 2² = 421516873 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421516871) 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 as a sum of consecutive naturals, namely, 210758438 + 210758439.

It is an arithmetic number, because the mean of its divisors is an integer number (210758439).

Almost surely, 2^421516877 is an apocalyptic number.

It is an amenable number.

421516877 is a deficient number, since it is larger than the sum of its proper divisors (1).

421516877 is an equidigital number, since it uses as much as digits as its factorization.

421516877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 41.

The square root of 421516877 is about 20530.8761868557. The cubic root of 421516877 is about 749.7877188843.

The spelling of 421516877 in words is "four hundred twenty-one million, five hundred sixteen thousand, eight hundred seventy-seven".