1998131554 has 8 divisors (see below), whose sum is σ = 2997395280. Its totient is φ = 998999796.

The previous prime is 1998131549. The next prime is 1998131557. The reversal of 1998131554 is 4551318991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1998131557) 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, 25857 + ... + 68299.

It is an arithmetic number, because the mean of its divisors is an integer number (374674410).

Almost surely, 2^1998131554 is an apocalyptic number.

1998131554 is a deficient number, since it is larger than the sum of its proper divisors (999263726).

1998131554 is a wasteful number, since it uses less digits than its factorization.

1998131554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65984.

The product of its digits is 194400, while the sum is 46.

The square root of 1998131554 is about 44700.4648074268. The cubic root of 1998131554 is about 1259.5285785766.

The spelling of 1998131554 in words is "one billion, nine hundred ninety-eight million, one hundred thirty-one thousand, five hundred fifty-four".