1987722201 has 16 divisors (see below), whose sum is σ = 2761371648. Its totient is φ = 1270410000.

The previous prime is 1987722197. The next prime is 1987722203. The reversal of 1987722201 is 1022277891.

It is not a de Polignac number, because 1987722201 - 2² = 1987722197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1987722201.

It is not an unprimeable number, because it can be changed into a prime (1987722203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89925 + ... + 109826.

It is an arithmetic number, because the mean of its divisors is an integer number (172585728).

Almost surely, 2^1987722201 is an apocalyptic number.

It is an amenable number.

1987722201 is a deficient number, since it is larger than the sum of its proper divisors (773649447).

1987722201 is a wasteful number, since it uses less digits than its factorization.

1987722201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199892.

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 1987722201 is about 44583.8782633364. The cubic root of 1987722201 is about 1257.3375798720.

The spelling of 1987722201 in words is "one billion, nine hundred eighty-seven million, seven hundred twenty-two thousand, two hundred one".