421511749 has 2 divisors, whose sum is σ = 421511750. Its totient is φ = 421511748.

The previous prime is 421511747. The next prime is 421511759. The reversal of 421511749 is 947115124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382984900 + 38526849 = 19570^2 + 6207^2 .

It is a cyclic number.

It is not a de Polignac number, because 421511749 - 2¹ = 421511747 is a prime.

Together with 421511747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421511747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210755874 + 210755875.

It is an arithmetic number, because the mean of its divisors is an integer number (210755875).

Almost surely, 2^421511749 is an apocalyptic number.

It is an amenable number.

421511749 is a deficient number, since it is larger than the sum of its proper divisors (1).

421511749 is an equidigital number, since it uses as much as digits as its factorization.

421511749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 421511749 is about 20530.7513014015. The cubic root of 421511749 is about 749.7846783362.

The spelling of 421511749 in words is "four hundred twenty-one million, five hundred eleven thousand, seven hundred forty-nine".