1887187137397 has 2 divisors, whose sum is σ = 1887187137398. Its totient is φ = 1887187137396.

The previous prime is 1887187137389. The next prime is 1887187137419. The reversal of 1887187137397 is 7937317817881.

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., 1019142744676 + 868044392721 = 1009526^2 + 931689^2 .

It is an emirp because it is prime and its reverse (7937317817881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1887187137397 - 2³ = 1887187137389 is a prime.

It is a super-2 number, since 2×1887187137397² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1887187137317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 943593568698 + 943593568699.

It is an arithmetic number, because the mean of its divisors is an integer number (943593568699).

Almost surely, 2^{1887187137397} is an apocalyptic number.

It is an amenable number.

1887187137397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1887187137397 is an equidigital number, since it uses as much as digits as its factorization.

1887187137397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99574272, while the sum is 70.

The spelling of 1887187137397 in words is "one trillion, eight hundred eighty-seven billion, one hundred eighty-seven million, one hundred thirty-seven thousand, three hundred ninety-seven".