3131501 has 2 divisors, whose sum is σ = 3131502. Its totient is φ = 3131500.

The previous prime is 3131497. The next prime is 3131503. The reversal of 3131501 is 1051313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2449225 + 682276 = 1565^2 + 826^2 .

It is an emirp because it is prime and its reverse (1051313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3131501 - 2² = 3131497 is a prime.

Together with 3131503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131503) 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 as a sum of consecutive naturals, namely, 1565750 + 1565751.

It is an arithmetic number, because the mean of its divisors is an integer number (1565751).

Almost surely, 2^3131501 is an apocalyptic number.

It is an amenable number.

3131501 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131501 is an equidigital number, since it uses as much as digits as its factorization.

3131501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 3131501 is about 1769.6047581310. The cubic root of 3131501 is about 146.3021982328.

Adding to 3131501 its reverse (1051313), we get a palindrome (4182814).

The spelling of 3131501 in words is "three million, one hundred thirty-one thousand, five hundred one".