3145158721 has 4 divisors (see below), whose sum is σ = 3253612500. Its totient is φ = 3036704944.

The previous prime is 3145158707. The next prime is 3145158739. The reversal of 3145158721 is 1278515413.

3145158721 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 797271696 + 2347887025 = 28236^2 + 48455^2 .

It is a cyclic number.

It is not a de Polignac number, because 3145158721 - 2¹³ = 3145150529 is a prime.

It is a super-3 number, since 3×3145158721³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3145138721) 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, 54226846 + ... + 54226903.

It is an arithmetic number, because the mean of its divisors is an integer number (813403125).

Almost surely, 2^3145158721 is an apocalyptic number.

It is an amenable number.

3145158721 is a deficient number, since it is larger than the sum of its proper divisors (108453779).

3145158721 is a wasteful number, since it uses less digits than its factorization.

3145158721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108453778.

The product of its digits is 33600, while the sum is 37.

The square root of 3145158721 is about 56081.7146759976. The cubic root of 3145158721 is about 1465.1458378503.

The spelling of 3145158721 in words is "three billion, one hundred forty-five million, one hundred fifty-eight thousand, seven hundred twenty-one".