421649519 has 2 divisors, whose sum is σ = 421649520. Its totient is φ = 421649518.

The previous prime is 421649509. The next prime is 421649537. The reversal of 421649519 is 915946124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421649519 is a prime.

It is a super-2 number, since 2×421649519² = 355576633745862722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421649509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210824759 + 210824760.

It is an arithmetic number, because the mean of its divisors is an integer number (210824760).

Almost surely, 2^421649519 is an apocalyptic number.

421649519 is a deficient number, since it is larger than the sum of its proper divisors (1).

421649519 is an equidigital number, since it uses as much as digits as its factorization.

421649519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 41.

The square root of 421649519 is about 20534.1062381590. The cubic root of 421649519 is about 749.8663578174.

It can be divided in two parts, 4216 and 49519, that added together give a palindrome (53735).

The spelling of 421649519 in words is "four hundred twenty-one million, six hundred forty-nine thousand, five hundred nineteen".