1988551291 has 4 divisors (see below), whose sum is σ = 2037052584. Its totient is φ = 1940050000.

The previous prime is 1988551283. The next prime is 1988551303. The reversal of 1988551291 is 1921558891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1988551291 - 2³ = 1988551283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988551231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24250585 + ... + 24250666.

It is an arithmetic number, because the mean of its divisors is an integer number (509263146).

Almost surely, 2^1988551291 is an apocalyptic number.

1988551291 is a deficient number, since it is larger than the sum of its proper divisors (48501293).

1988551291 is an equidigital number, since it uses as much as digits as its factorization.

1988551291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48501292.

The product of its digits is 259200, while the sum is 49.

The square root of 1988551291 is about 44593.1753859265. The cubic root of 1988551291 is about 1257.5123697413.

The spelling of 1988551291 in words is "one billion, nine hundred eighty-eight million, five hundred fifty-one thousand, two hundred ninety-one".