6900509749 has 16 divisors (see below), whose sum is σ = 8240762880. Its totient is φ = 5649597360.

The previous prime is 6900509717. The next prime is 6900509767. The reversal of 6900509749 is 9479050096.

It is a cyclic number.

It is not a de Polignac number, because 6900509749 - 2⁵ = 6900509717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6900509789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85954 + ... + 145564.

It is an arithmetic number, because the mean of its divisors is an integer number (515047680).

Almost surely, 2^6900509749 is an apocalyptic number.

It is an amenable number.

6900509749 is a deficient number, since it is larger than the sum of its proper divisors (1340253131).

6900509749 is a wasteful number, since it uses less digits than its factorization.

6900509749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60360.

The product of its (nonzero) digits is 612360, while the sum is 49.

The square root of 6900509749 is about 83069.3069009246. The cubic root of 6900509749 is about 1903.8251424062.

The spelling of 6900509749 in words is "six billion, nine hundred million, five hundred nine thousand, seven hundred forty-nine".