6949137561 has 4 divisors (see below), whose sum is σ = 9265516752. Its totient is φ = 4632758372.

The previous prime is 6949137553. The next prime is 6949137563. The reversal of 6949137561 is 1657319496.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6949137561 - 2³ = 6949137553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6949137563) 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, 1158189591 + ... + 1158189596.

It is an arithmetic number, because the mean of its divisors is an integer number (2316379188).

Almost surely, 2^6949137561 is an apocalyptic number.

It is an amenable number.

6949137561 is a deficient number, since it is larger than the sum of its proper divisors (2316379191).

6949137561 is a wasteful number, since it uses less digits than its factorization.

6949137561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316379190.

The product of its digits is 1224720, while the sum is 51.

The square root of 6949137561 is about 83361.4872767995. The cubic root of 6949137561 is about 1908.2867563307.

The spelling of 6949137561 in words is "six billion, nine hundred forty-nine million, one hundred thirty-seven thousand, five hundred sixty-one".