3121864281 has 16 divisors (see below), whose sum is σ = 4627008000. Its totient is φ = 2080332144.

The previous prime is 3121864279. The next prime is 3121864321. The reversal of 3121864281 is 1824681213.

3121864281 is a `hidden beast` number, since 3 + 1 + 2 + 1 + 8 + 642 + 8 + 1 = 666.

It is not a de Polignac number, because 3121864281 - 2¹ = 3121864279 is a prime.

It is a super-2 number, since 2×3121864281² = 19492073177967293922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3121864201) 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, 40675 + ... + 88871.

It is an arithmetic number, because the mean of its divisors is an integer number (289188000).

Almost surely, 2^3121864281 is an apocalyptic number.

It is an amenable number.

3121864281 is a deficient number, since it is larger than the sum of its proper divisors (1505143719).

3121864281 is a wasteful number, since it uses less digits than its factorization.

3121864281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50605 (or 50599 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 3121864281 is about 55873.6456748618. The cubic root of 3121864281 is about 1461.5196975613.

The spelling of 3121864281 in words is "three billion, one hundred twenty-one million, eight hundred sixty-four thousand, two hundred eighty-one".