1409842781 has 2 divisors, whose sum is σ = 1409842782. Its totient is φ = 1409842780.

The previous prime is 1409842727. The next prime is 1409842787. The reversal of 1409842781 is 1872489041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1282356100 + 127486681 = 35810^2 + 11291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1409842781 is a prime.

It is a super-2 number, since 2×1409842781² = 3975313334275627922, which contains 22 as substring.

It is a Sophie Germain 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 (1409842787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 704921390 + 704921391.

It is an arithmetic number, because the mean of its divisors is an integer number (704921391).

Almost surely, 2^1409842781 is an apocalyptic number.

It is an amenable number.

1409842781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1409842781 is an equidigital number, since it uses as much as digits as its factorization.

1409842781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 1409842781 is about 37547.8731887706. The cubic root of 1409842781 is about 1121.3044911452.

The spelling of 1409842781 in words is "one billion, four hundred nine million, eight hundred forty-two thousand, seven hundred eighty-one".