3121897 has 8 divisors (see below), whose sum is σ = 3321000. Its totient is φ = 2924544.

The previous prime is 3121891. The next prime is 3121901. The reversal of 3121897 is 7981213.

It can be written as a sum of positive squares in 4 ways, for example, as 1731856 + 1390041 = 1316^2 + 1179^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-3121897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6729 + ... + 7177.

It is an arithmetic number, because the mean of its divisors is an integer number (415125).

Almost surely, 2^3121897 is an apocalyptic number.

It is an amenable number.

3121897 is a deficient number, since it is larger than the sum of its proper divisors (199103).

3121897 is a wasteful number, since it uses less digits than its factorization.

3121897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875.

The product of its digits is 3024, while the sum is 31.

The square root of 3121897 is about 1766.8890740508. The cubic root of 3121897 is about 146.1524803410.

It can be divided in two parts, 312 and 1897, that added together give a square (2209 = 47²).

The spelling of 3121897 in words is "three million, one hundred twenty-one thousand, eight hundred ninety-seven".