19881001037 has 2 divisors, whose sum is σ = 19881001038. Its totient is φ = 19881001036.

The previous prime is 19881000959. The next prime is 19881001051. The reversal of 19881001037 is 73010018891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18435936841 + 1445064196 = 135779^2 + 38014^2 .

It is a cyclic number.

It is not a de Polignac number, because 19881001037 - 2⁸ = 19881000781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19881001087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940500518 + 9940500519.

It is an arithmetic number, because the mean of its divisors is an integer number (9940500519).

Almost surely, 2^19881001037 is an apocalyptic number.

It is an amenable number.

19881001037 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881001037 is an equidigital number, since it uses as much as digits as its factorization.

19881001037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 38.

The spelling of 19881001037 in words is "nineteen billion, eight hundred eighty-one million, one thousand, thirty-seven".