3121431 has 16 divisors (see below), whose sum is σ = 4353888. Its totient is φ = 1987200.

The previous prime is 3121429. The next prime is 3121441. The reversal of 3121431 is 1341213.

It is not a de Polignac number, because 3121431 - 2¹ = 3121429 is a prime.

It is a super-2 number, since 2×3121431² = 19486662975522, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121441) 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, 6541 + ... + 7001.

It is an arithmetic number, because the mean of its divisors is an integer number (272118).

Almost surely, 2^3121431 is an apocalyptic number.

3121431 is a deficient number, since it is larger than the sum of its proper divisors (1232457).

3121431 is a wasteful number, since it uses less digits than its factorization.

3121431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562.

The product of its digits is 72, while the sum is 15.

The square root of 3121431 is about 1766.7571989382. The cubic root of 3121431 is about 146.1452080057.

Adding to 3121431 its reverse (1341213), we get a palindrome (4462644).

The spelling of 3121431 in words is "three million, one hundred twenty-one thousand, four hundred thirty-one".