7291531998 has 48 divisors (see below), whose sum is σ = 16660971600. Its totient is φ = 2298274560.

The previous prime is 7291531997. The next prime is 7291532029. The reversal of 7291531998 is 8991351927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7291531991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165318 + ... + 204726.

It is an arithmetic number, because the mean of its divisors is an integer number (347103575).

Almost surely, 2^7291531998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7291531998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8330485800).

7291531998 is an abundant number, since it is smaller than the sum of its proper divisors (9369439602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7291531998 is a wasteful number, since it uses less digits than its factorization.

7291531998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39977 (or 39974 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 7291531998 is about 85390.4678403860. The cubic root of 7291531998 is about 1939.1270382491.

The spelling of 7291531998 in words is "seven billion, two hundred ninety-one million, five hundred thirty-one thousand, nine hundred ninety-eight".