31419121 has 2 divisors, whose sum is σ = 31419122. Its totient is φ = 31419120.

The previous prime is 31419119. The next prime is 31419163. The reversal of 31419121 is 12191413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 505521 = 5560^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 31419121 - 2¹ = 31419119 is a prime.

It is a super-2 number, since 2×31419121² = 1974322328825282, which contains 22 as substring.

Together with 31419119, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 31419092 and 31419101.

It is not a weakly prime, because it can be changed into another prime (31419191) 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, 15709560 + 15709561.

It is an arithmetic number, because the mean of its divisors is an integer number (15709561).

Almost surely, 2^31419121 is an apocalyptic number.

It is an amenable number.

31419121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31419121 is an equidigital number, since it uses as much as digits as its factorization.

31419121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 31419121 is about 5605.2761751764. The cubic root of 31419121 is about 315.5474514705.

The spelling of 31419121 in words is "thirty-one million, four hundred nineteen thousand, one hundred twenty-one".