1999101837487 has 2 divisors, whose sum is σ = 1999101837488. Its totient is φ = 1999101837486.

The previous prime is 1999101837449. The next prime is 1999101837493. The reversal of 1999101837487 is 7847381019991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999101837487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999101637487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999550918743 + 999550918744.

It is an arithmetic number, because the mean of its divisors is an integer number (999550918744).

Almost surely, 2^{1999101837487} is an apocalyptic number.

1999101837487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999101837487 is an equidigital number, since it uses as much as digits as its factorization.

1999101837487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 67.

The spelling of 1999101837487 in words is "one trillion, nine hundred ninety-nine billion, one hundred one million, eight hundred thirty-seven thousand, four hundred eighty-seven".