3131642 has 4 divisors (see below), whose sum is σ = 4697466. Its totient is φ = 1565820.

The previous prime is 3131641. The next prime is 3131669. The reversal of 3131642 is 2461313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2493241 + 638401 = 1579^2 + 799^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3131641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 782909 + ... + 782912.

Almost surely, 2^3131642 is an apocalyptic number.

3131642 is a deficient number, since it is larger than the sum of its proper divisors (1565824).

3131642 is a wasteful number, since it uses less digits than its factorization.

3131642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565823.

The product of its digits is 432, while the sum is 20.

The square root of 3131642 is about 1769.6445970872. The cubic root of 3131642 is about 146.3043940169.

Adding to 3131642 its reverse (2461313), we get a palindrome (5592955).

It can be divided in two parts, 3131 and 642, that multiplied together give a palindrome (2010102).

The spelling of 3131642 in words is "three million, one hundred thirty-one thousand, six hundred forty-two".