6891042137 has 6 divisors (see below), whose sum is σ = 8016110298. Its totient is φ = 5906607504.

The previous prime is 6891042131. The next prime is 6891042143. The reversal of 6891042137 is 7312401986.

It is an interprime number because it is at equal distance from previous prime (6891042131) and next prime (6891042143).

It can be written as a sum of positive squares in only one way, i.e., 6715638601 + 175403536 = 81949^2 + 13244^2 .

It is not a de Polignac number, because 6891042137 - 2⁸ = 6891041881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6891042094 and 6891042103.

It is not an unprimeable number, because it can be changed into a prime (6891042131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70316708 + ... + 70316805.

It is an arithmetic number, because the mean of its divisors is an integer number (1336018383).

Almost surely, 2^6891042137 is an apocalyptic number.

It is an amenable number.

6891042137 is a deficient number, since it is larger than the sum of its proper divisors (1125068161).

6891042137 is a wasteful number, since it uses less digits than its factorization.

6891042137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140633527 (or 140633520 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 6891042137 is about 83012.3011185692. The cubic root of 6891042137 is about 1902.9540508447.

The spelling of 6891042137 in words is "six billion, eight hundred ninety-one million, forty-two thousand, one hundred thirty-seven".