31645541 has 2 divisors, whose sum is σ = 31645542. Its totient is φ = 31645540.

The previous prime is 31645531. The next prime is 31645543. The reversal of 31645541 is 14554613.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28569025 + 3076516 = 5345^2 + 1754^2 .

It is an emirp because it is prime and its reverse (14554613) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31645541 - 2⁶ = 31645477 is a prime.

It is a Sophie Germain prime.

Together with 31645543, 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 (31645543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15822770 + 15822771.

It is an arithmetic number, because the mean of its divisors is an integer number (15822771).

Almost surely, 2^31645541 is an apocalyptic number.

It is an amenable number.

31645541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31645541 is an equidigital number, since it uses as much as digits as its factorization.

31645541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 31645541 is about 5625.4369608058. The cubic root of 31645541 is about 316.3036291435.

The spelling of 31645541 in words is "thirty-one million, six hundred forty-five thousand, five hundred forty-one".