1461565421 has 2 divisors, whose sum is σ = 1461565422. Its totient is φ = 1461565420.

The previous prime is 1461565397. The next prime is 1461565423. The reversal of 1461565421 is 1245651641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220104900 + 241460521 = 34930^2 + 15539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1461565421 is a prime.

It is a Sophie Germain prime.

Together with 1461565423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1461565423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730782710 + 730782711.

It is an arithmetic number, because the mean of its divisors is an integer number (730782711).

Almost surely, 2^1461565421 is an apocalyptic number.

It is an amenable number.

1461565421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461565421 is an equidigital number, since it uses as much as digits as its factorization.

1461565421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 35.

The square root of 1461565421 is about 38230.4253311417. The cubic root of 1461565421 is about 1134.8525029727.

The spelling of 1461565421 in words is "one billion, four hundred sixty-one million, five hundred sixty-five thousand, four hundred twenty-one".