35538961981 has 2 divisors, whose sum is σ = 35538961982. Its totient is φ = 35538961980.

The previous prime is 35538961949. The next prime is 35538962029. The reversal of 35538961981 is 18916983553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33800822500 + 1738139481 = 183850^2 + 41691^2 .

It is a cyclic number.

It is not a de Polignac number, because 35538961981 - 2⁵ = 35538961949 is a prime.

It is a super-2 number, since 2×35538961981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (35538965981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17769480990 + 17769480991.

It is an arithmetic number, because the mean of its divisors is an integer number (17769480991).

Almost surely, 2^35538961981 is an apocalyptic number.

It is an amenable number.

35538961981 is a deficient number, since it is larger than the sum of its proper divisors (1).

35538961981 is an equidigital number, since it uses as much as digits as its factorization.

35538961981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6998400, while the sum is 58.

The spelling of 35538961981 in words is "thirty-five billion, five hundred thirty-eight million, nine hundred sixty-one thousand, nine hundred eighty-one".