988720511 has 4 divisors (see below), whose sum is σ = 1002646224. Its totient is φ = 974794800.

The previous prime is 988720489. The next prime is 988720547. The reversal of 988720511 is 115027889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115027889 = 107 ⋅1075027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988720511 is a prime.

It is a super-2 number, since 2×988720511² = 1955136497744202242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988720571) 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, 6962750 + ... + 6962891.

It is an arithmetic number, because the mean of its divisors is an integer number (250661556).

Almost surely, 2^988720511 is an apocalyptic number.

988720511 is a deficient number, since it is larger than the sum of its proper divisors (13925713).

988720511 is a wasteful number, since it uses less digits than its factorization.

988720511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13925712.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 988720511 is about 31443.9264564717. The cubic root of 988720511 is about 996.2259447589.

The spelling of 988720511 in words is "nine hundred eighty-eight million, seven hundred twenty thousand, five hundred eleven".