31162541 has 2 divisors, whose sum is σ = 31162542. Its totient is φ = 31162540.

The previous prime is 31162529. The next prime is 31162543. The reversal of 31162541 is 14526113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31024900 + 137641 = 5570^2 + 371^2 .

It is a cyclic number.

It is not a de Polignac number, because 31162541 - 2⁶ = 31162477 is a prime.

It is a super-2 number, since 2×31162541² = 1942207923153362, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 31162543, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31162543) 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, 15581270 + 15581271.

It is an arithmetic number, because the mean of its divisors is an integer number (15581271).

Almost surely, 2^31162541 is an apocalyptic number.

It is an amenable number.

31162541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31162541 is an equidigital number, since it uses as much as digits as its factorization.

31162541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 31162541 is about 5582.3418920736. The cubic root of 31162541 is about 314.6861440940.

Adding to 31162541 its reverse (14526113), we get a palindrome (45688654).

The spelling of 31162541 in words is "thirty-one million, one hundred sixty-two thousand, five hundred forty-one".