3139581 has 4 divisors (see below), whose sum is σ = 4186112. Its totient is φ = 2093052.

The previous prime is 3139573. The next prime is 3139583. The reversal of 3139581 is 1859313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1859313 = 3 ⋅619771.

It is not a de Polignac number, because 3139581 - 2³ = 3139573 is a prime.

It is a super-2 number, since 2×3139581² = 19713937711122, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3139583) 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, 523261 + ... + 523266.

It is an arithmetic number, because the mean of its divisors is an integer number (1046528).

Almost surely, 2^3139581 is an apocalyptic number.

It is an amenable number.

3139581 is a deficient number, since it is larger than the sum of its proper divisors (1046531).

3139581 is a wasteful number, since it uses less digits than its factorization.

3139581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046530.

The product of its digits is 3240, while the sum is 30.

The square root of 3139581 is about 1771.8862830329. The cubic root of 3139581 is about 146.4279213818.

The spelling of 3139581 in words is "three million, one hundred thirty-nine thousand, five hundred eighty-one".