1988205251 has 16 divisors (see below), whose sum is σ = 2054720640. Its totient is φ = 1922641920.

The previous prime is 1988205227. The next prime is 1988205283. The reversal of 1988205251 is 1525028891.

It is a cyclic number.

It is not a de Polignac number, because 1988205251 - 2¹⁰ = 1988204227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1988205199 and 1988205208.

It is not an unprimeable number, because it can be changed into a prime (1988205211) 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, 3445475 + ... + 3446051.

It is an arithmetic number, because the mean of its divisors is an integer number (128420040).

Almost surely, 2^1988205251 is an apocalyptic number.

1988205251 is a deficient number, since it is larger than the sum of its proper divisors (66515389).

1988205251 is a wasteful number, since it uses less digits than its factorization.

1988205251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214.

The product of its (nonzero) digits is 57600, while the sum is 41.

The square root of 1988205251 is about 44589.2952512147. The cubic root of 1988205251 is about 1257.4394230312.

The spelling of 1988205251 in words is "one billion, nine hundred eighty-eight million, two hundred five thousand, two hundred fifty-one".