3121690073 has 4 divisors (see below), whose sum is σ = 3121953588. Its totient is φ = 3121426560.

The previous prime is 3121690069. The next prime is 3121690079. The reversal of 3121690073 is 3700961213.

It is a happy number.

3121690073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1511032384 + 1610657689 = 38872^2 + 40133^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121690073 - 2² = 3121690069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3121690079) 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, 113108 + ... + 137973.

It is an arithmetic number, because the mean of its divisors is an integer number (780488397).

Almost surely, 2^3121690073 is an apocalyptic number.

It is an amenable number.

3121690073 is a deficient number, since it is larger than the sum of its proper divisors (263515).

3121690073 is a wasteful number, since it uses less digits than its factorization.

3121690073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263514.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 3121690073 is about 55872.0867070490. The cubic root of 3121690073 is about 1461.4925115450.

The spelling of 3121690073 in words is "three billion, one hundred twenty-one million, six hundred ninety thousand, seventy-three".