3158940821 has 8 divisors (see below), whose sum is σ = 3228713784. Its totient is φ = 3089544640.

The previous prime is 3158940809. The next prime is 3158940839. The reversal of 3158940821 is 1280498513.

3158940821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 541492900 + 2617447921 = 23270^2 + 51161^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3158940821 is a prime.

It is a super-2 number, since 2×3158940821² = 19957814221160308082, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3158900821) 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, 77210 + ... + 110811.

It is an arithmetic number, because the mean of its divisors is an integer number (403589223).

Almost surely, 2^3158940821 is an apocalyptic number.

It is an amenable number.

3158940821 is a deficient number, since it is larger than the sum of its proper divisors (69772963).

3158940821 is a wasteful number, since it uses less digits than its factorization.

3158940821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188391.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 3158940821 is about 56204.4555262303. The cubic root of 3158940821 is about 1467.2828114103.

The spelling of 3158940821 in words is "three billion, one hundred fifty-eight million, nine hundred forty thousand, eight hundred twenty-one".