1935974981 has 2 divisors, whose sum is σ = 1935974982. Its totient is φ = 1935974980.

The previous prime is 1935974959. The next prime is 1935975031. The reversal of 1935974981 is 1894795391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1458552481 + 477422500 = 38191^2 + 21850^2 .

It is an emirp because it is prime and its reverse (1894795391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1935974981 is a prime.

It is a super-2 number, since 2×1935974981² = 7495998254115900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1935974921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 967987490 + 967987491.

It is an arithmetic number, because the mean of its divisors is an integer number (967987491).

Almost surely, 2^1935974981 is an apocalyptic number.

It is an amenable number.

1935974981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1935974981 is an equidigital number, since it uses as much as digits as its factorization.

1935974981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 56.

The square root of 1935974981 is about 43999.7156922633. The cubic root of 1935974981 is about 1246.3305680356.

The spelling of 1935974981 in words is "one billion, nine hundred thirty-five million, nine hundred seventy-four thousand, nine hundred eighty-one".