8121690723 has 8 divisors (see below), whose sum is σ = 10829418768. Its totient is φ = 5414211584.

The previous prime is 8121690719. The next prime is 8121690749. The reversal of 8121690723 is 3270961218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8121690723 - 2² = 8121690719 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (8121690763) 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, 36115 + ... + 132467.

It is an arithmetic number, because the mean of its divisors is an integer number (1353677346).

Almost surely, 2^8121690723 is an apocalyptic number.

8121690723 is a deficient number, since it is larger than the sum of its proper divisors (2707728045).

8121690723 is a wasteful number, since it uses less digits than its factorization.

8121690723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124453.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 8121690723 is about 90120.4234510691. The cubic root of 8121690723 is about 2010.0899048917.

The spelling of 8121690723 in words is "eight billion, one hundred twenty-one million, six hundred ninety thousand, seven hundred twenty-three".