1596671981 has 2 divisors, whose sum is σ = 1596671982. Its totient is φ = 1596671980.

The previous prime is 1596671971. The next prime is 1596672013. The reversal of 1596671981 is 1891766951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1588022500 + 8649481 = 39850^2 + 2941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1596671981 - 2⁶ = 1596671917 is a prime.

It is a super-2 number, since 2×1596671981² = 5098722829820928722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1596671911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 798335990 + 798335991.

It is an arithmetic number, because the mean of its divisors is an integer number (798335991).

Almost surely, 2^1596671981 is an apocalyptic number.

It is an amenable number.

1596671981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1596671981 is an equidigital number, since it uses as much as digits as its factorization.

1596671981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 53.

The square root of 1596671981 is about 39958.3781077260. The cubic root of 1596671981 is about 1168.7956001692.

The spelling of 1596671981 in words is "one billion, five hundred ninety-six million, six hundred seventy-one thousand, nine hundred eighty-one".