1421569 has 2 divisors, whose sum is σ = 1421570. Its totient is φ = 1421568.

The previous prime is 1421549. The next prime is 1421603. The reversal of 1421569 is 9651241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1129969 + 291600 = 1063^2 + 540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421569 is a prime.

It is a super-2 number, since 2×1421569² = 4041716843522, which contains 22 as substring.

It is a Chen prime.

1421569 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1421549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710784 + 710785.

It is an arithmetic number, because the mean of its divisors is an integer number (710785).

2^1421569 is an apocalyptic number.

It is an amenable number.

1421569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421569 is an equidigital number, since it uses as much as digits as its factorization.

1421569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 1421569 is about 1192.2956848031. The cubic root of 1421569 is about 112.4404689153.

It can be divided in two parts, 142 and 1569, that added together give a triangular number (1711 = T₅₈).

The spelling of 1421569 in words is "one million, four hundred twenty-one thousand, five hundred sixty-nine".