1937451613081 has 2 divisors, whose sum is σ = 1937451613082. Its totient is φ = 1937451613080.

The previous prime is 1937451613079. The next prime is 1937451613091. The reversal of 1937451613081 is 1803161547391.

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., 1884898343056 + 52553270025 = 1372916^2 + 229245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1937451613081 - 2¹ = 1937451613079 is a prime.

It is a super-2 number, since 2×1937451613081² (a number of 25 digits) contains 22 as substring.

Together with 1937451613079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1937451613091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 968725806540 + 968725806541.

It is an arithmetic number, because the mean of its divisors is an integer number (968725806541).

Almost surely, 2^{1937451613081} is an apocalyptic number.

It is an amenable number.

1937451613081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1937451613081 is an equidigital number, since it uses as much as digits as its factorization.

1937451613081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 49.

The spelling of 1937451613081 in words is "one trillion, nine hundred thirty-seven billion, four hundred fifty-one million, six hundred thirteen thousand, eighty-one".