31390141 has 2 divisors, whose sum is σ = 31390142. Its totient is φ = 31390140.

The previous prime is 31390127. The next prime is 31390153. The reversal of 31390141 is 14109313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30758116 + 632025 = 5546^2 + 795^2 .

It is an emirp because it is prime and its reverse (14109313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31390141 - 2⁷ = 31390013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31390111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15695070 + 15695071.

It is an arithmetic number, because the mean of its divisors is an integer number (15695071).

Almost surely, 2^31390141 is an apocalyptic number.

It is an amenable number.

31390141 is a deficient number, since it is larger than the sum of its proper divisors (1).

31390141 is an equidigital number, since it uses as much as digits as its factorization.

31390141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31390141 is about 5602.6905143868. The cubic root of 31390141 is about 315.4504046421.

Adding to 31390141 its reverse (14109313), we get a palindrome (45499454).

The spelling of 31390141 in words is "thirty-one million, three hundred ninety thousand, one hundred forty-one".