5431721898 has 8 divisors (see below), whose sum is σ = 10863443808. Its totient is φ = 1810573964.

The previous prime is 5431721879. The next prime is 5431721903. The reversal of 5431721898 is 8981271345.

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

5431721898 is an admirable number.

It is a Curzon number.

It is a zygodrome in base 4.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 452643486 + ... + 452643497.

It is an arithmetic number, because the mean of its divisors is an integer number (1357930476).

Almost surely, 2^5431721898 is an apocalyptic number.

5431721898 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

5431721898 is a wasteful number, since it uses less digits than its factorization.

5431721898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905286988.

The product of its digits is 483840, while the sum is 48.

The square root of 5431721898 is about 73700.2164040242. The cubic root of 5431721898 is about 1757.8393227303.

The spelling of 5431721898 in words is "five billion, four hundred thirty-one million, seven hundred twenty-one thousand, eight hundred ninety-eight".