1681371401 has 2 divisors, whose sum is σ = 1681371402. Its totient is φ = 1681371400.

The previous prime is 1681371347. The next prime is 1681371413. The reversal of 1681371401 is 1041731861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 885003001 + 796368400 = 29749^2 + 28220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1681371401 - 2¹⁸ = 1681109257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681371481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840685700 + 840685701.

It is an arithmetic number, because the mean of its divisors is an integer number (840685701).

Almost surely, 2^1681371401 is an apocalyptic number.

It is an amenable number.

1681371401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681371401 is an equidigital number, since it uses as much as digits as its factorization.

1681371401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1681371401 is about 41004.5290303401. The cubic root of 1681371401 is about 1189.1077748171.

The spelling of 1681371401 in words is "one billion, six hundred eighty-one million, three hundred seventy-one thousand, four hundred one".