1201999999987 has 2 divisors, whose sum is σ = 1201999999988. Its totient is φ = 1201999999986.

The previous prime is 1201999999973. The next prime is 1202000000009. The reversal of 1201999999987 is 7899999991021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201999999987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1201999999987.

It is not a weakly prime, because it can be changed into another prime (1201999999927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600999999993 + 600999999994.

It is an arithmetic number, because the mean of its divisors is an integer number (600999999994).

Almost surely, 2^{1201999999987} is an apocalyptic number.

1201999999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201999999987 is an equidigital number, since it uses as much as digits as its factorization.

1201999999987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 535692528, while the sum is 82.

The spelling of 1201999999987 in words is "one trillion, two hundred one billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".