1987906201 has 4 divisors (see below), whose sum is σ = 1989522304. Its totient is φ = 1986290100.

The previous prime is 1987906189. The next prime is 1987906213. The reversal of 1987906201 is 1026097891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1987906189) and next prime (1987906213).

It is a cyclic number.

It is not a de Polignac number, because 1987906201 - 2²³ = 1979517593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987906231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806205 + ... + 808666.

It is an arithmetic number, because the mean of its divisors is an integer number (497380576).

Almost surely, 2^1987906201 is an apocalyptic number.

It is an amenable number.

1987906201 is a deficient number, since it is larger than the sum of its proper divisors (1616103).

1987906201 is a wasteful number, since it uses less digits than its factorization.

1987906201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616102.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 1987906201 is about 44585.9417417643. The cubic root of 1987906201 is about 1257.3763751954.

The spelling of 1987906201 in words is "one billion, nine hundred eighty-seven million, nine hundred six thousand, two hundred one".