31421101 has 2 divisors, whose sum is σ = 31421102. Its totient is φ = 31421100.

The previous prime is 31421081. The next prime is 31421107. The reversal of 31421101 is 10112413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24265476 + 7155625 = 4926^2 + 2675^2 .

It is an emirp because it is prime and its reverse (10112413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31421101 - 2⁵ = 31421069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31421107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710550 + 15710551.

It is an arithmetic number, because the mean of its divisors is an integer number (15710551).

Almost surely, 2^31421101 is an apocalyptic number.

It is an amenable number.

31421101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31421101 is an equidigital number, since it uses as much as digits as its factorization.

31421101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 31421101 is about 5605.4527917020. The cubic root of 31421101 is about 315.5540798209.

Adding to 31421101 its reverse (10112413), we get a palindrome (41533514).

The spelling of 31421101 in words is "thirty-one million, four hundred twenty-one thousand, one hundred one".