988721555 has 8 divisors (see below), whose sum is σ = 1187062800. Its totient is φ = 790579296.

The previous prime is 988721509. The next prime is 988721593. The reversal of 988721555 is 555127889.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 988721555 - 2⁶ = 988721491 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38585 + ... + 58874.

It is an arithmetic number, because the mean of its divisors is an integer number (148382850).

Almost surely, 2^988721555 is an apocalyptic number.

988721555 is a deficient number, since it is larger than the sum of its proper divisors (198341245).

988721555 is a wasteful number, since it uses less digits than its factorization.

988721555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99493.

The product of its digits is 1008000, while the sum is 50.

The square root of 988721555 is about 31443.9430574475. The cubic root of 988721555 is about 996.2262954005.

The spelling of 988721555 in words is "nine hundred eighty-eight million, seven hundred twenty-one thousand, five hundred fifty-five".