6989788431 has 8 divisors (see below), whose sum is σ = 10355242160. Its totient is φ = 4659858936.

The previous prime is 6989788427. The next prime is 6989788433. The reversal of 6989788431 is 1348879896.

It is not a de Polignac number, because 6989788431 - 2² = 6989788427 is a prime.

It is a super-2 number, since 2×6989788431² = 97714284620282883522, 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 (6989788433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129440500 + ... + 129440553.

It is an arithmetic number, because the mean of its divisors is an integer number (1294405270).

Almost surely, 2^6989788431 is an apocalyptic number.

6989788431 is a deficient number, since it is larger than the sum of its proper divisors (3365453729).

6989788431 is a wasteful number, since it uses less digits than its factorization.

6989788431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258881062 (or 258881056 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 63.

The square root of 6989788431 is about 83604.9545840436. The cubic root of 6989788431 is about 1912.0005382396. Note that the first 3 decimals are identical.

The spelling of 6989788431 in words is "six billion, nine hundred eighty-nine million, seven hundred eighty-eight thousand, four hundred thirty-one".