1201001987 has 2 divisors, whose sum is σ = 1201001988. Its totient is φ = 1201001986.

The previous prime is 1201001959. The next prime is 1201002013. The reversal of 1201001987 is 7891001021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201001987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201001947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600500993 + 600500994.

It is an arithmetic number, because the mean of its divisors is an integer number (600500994).

Almost surely, 2^1201001987 is an apocalyptic number.

1201001987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201001987 is an equidigital number, since it uses as much as digits as its factorization.

1201001987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 1201001987 is about 34655.4755702472. The cubic root of 1201001987 is about 1062.9542563637.

The spelling of 1201001987 in words is "one billion, two hundred one million, one thousand, nine hundred eighty-seven".