6251890741981 has 2 divisors, whose sum is σ = 6251890741982. Its totient is φ = 6251890741980.

The previous prime is 6251890741951. The next prime is 6251890742033. The reversal of 6251890741981 is 1891470981526.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845948509881 + 2405942232100 = 1961109^2 + 1551110^2 .

It is a cyclic number.

It is not a de Polignac number, because 6251890741981 - 2⁵ = 6251890741949 is a prime.

It is a super-2 number, since 2×6251890741981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6251890741951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3125945370990 + 3125945370991.

It is an arithmetic number, because the mean of its divisors is an integer number (3125945370991).

Almost surely, 2^{6251890741981} is an apocalyptic number.

It is an amenable number.

6251890741981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6251890741981 is an equidigital number, since it uses as much as digits as its factorization.

6251890741981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8709120, while the sum is 61.

The spelling of 6251890741981 in words is "six trillion, two hundred fifty-one billion, eight hundred ninety million, seven hundred forty-one thousand, nine hundred eighty-one".