1426891721 has 2 divisors, whose sum is σ = 1426891722. Its totient is φ = 1426891720.

The previous prime is 1426891679. The next prime is 1426891751. The reversal of 1426891721 is 1271986241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1040965696 + 385926025 = 32264^2 + 19645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1426891721 - 2⁶ = 1426891657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1426891751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713445860 + 713445861.

It is an arithmetic number, because the mean of its divisors is an integer number (713445861).

Almost surely, 2^1426891721 is an apocalyptic number.

It is an amenable number.

1426891721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1426891721 is an equidigital number, since it uses as much as digits as its factorization.

1426891721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 1426891721 is about 37774.2203228604. The cubic root of 1426891721 is about 1125.8062950055.

The spelling of 1426891721 in words is "one billion, four hundred twenty-six million, eight hundred ninety-one thousand, seven hundred twenty-one".