1374487243981 has 2 divisors, whose sum is σ = 1374487243982. Its totient is φ = 1374487243980.

The previous prime is 1374487243979. The next prime is 1374487244023. The reversal of 1374487243981 is 1893427844731.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1371379181481 + 3108062500 = 1171059^2 + 55750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1374487243981 - 2¹ = 1374487243979 is a prime.

It is a super-2 number, since 2×1374487243981² (a number of 25 digits) contains 22 as substring.

Together with 1374487243979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1374487243681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 687243621990 + 687243621991.

It is an arithmetic number, because the mean of its divisors is an integer number (687243621991).

Almost surely, 2^{1374487243981} is an apocalyptic number.

It is an amenable number.

1374487243981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1374487243981 is an equidigital number, since it uses as much as digits as its factorization.

1374487243981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 61.

The spelling of 1374487243981 in words is "one trillion, three hundred seventy-four billion, four hundred eighty-seven million, two hundred forty-three thousand, nine hundred eighty-one".