1341891721 has 2 divisors, whose sum is σ = 1341891722. Its totient is φ = 1341891720.

The previous prime is 1341891713. The next prime is 1341891797. The reversal of 1341891721 is 1271981431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090320400 + 251571321 = 33020^2 + 15861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1341891721 - 2³ = 1341891713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1341891521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670945860 + 670945861.

It is an arithmetic number, because the mean of its divisors is an integer number (670945861).

Almost surely, 2^1341891721 is an apocalyptic number.

It is an amenable number.

1341891721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1341891721 is an equidigital number, since it uses as much as digits as its factorization.

1341891721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 1341891721 is about 36631.8402622636. The cubic root of 1341891721 is about 1102.9923267062.

The spelling of 1341891721 in words is "one billion, three hundred forty-one million, eight hundred ninety-one thousand, seven hundred twenty-one".