3139621 has 2 divisors, whose sum is σ = 3139622. Its totient is φ = 3139620.

The previous prime is 3139607. The next prime is 3139639. The reversal of 3139621 is 1269313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2842596 + 297025 = 1686^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 3139621 - 2¹¹ = 3137573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3139601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569810 + 1569811.

It is an arithmetic number, because the mean of its divisors is an integer number (1569811).

Almost surely, 2^3139621 is an apocalyptic number.

It is an amenable number.

3139621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3139621 is an equidigital number, since it uses as much as digits as its factorization.

3139621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 3139621 is about 1771.8975704030. The cubic root of 3139621 is about 146.4285432367.

The spelling of 3139621 in words is "three million, one hundred thirty-nine thousand, six hundred twenty-one".