31420069 has 2 divisors, whose sum is σ = 31420070. Its totient is φ = 31420068.

The previous prime is 31420033. The next prime is 31420099. The reversal of 31420069 is 96002413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 15499969 = 3990^2 + 3937^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420069 - 2¹¹ = 31418021 is a prime.

It is a super-2 number, since 2×31420069² = 1974441471929522, which contains 22 as substring.

It is equal to p_1940263 and since 31420069 and 1940263 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31420009) 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, 15710034 + 15710035.

It is an arithmetic number, because the mean of its divisors is an integer number (15710035).

Almost surely, 2^31420069 is an apocalyptic number.

It is an amenable number.

31420069 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420069 is an equidigital number, since it uses as much as digits as its factorization.

31420069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31420069 is about 5605.3607377224. The cubic root of 31420069 is about 315.5506250791.

The spelling of 31420069 in words is "thirty-one million, four hundred twenty thousand, sixty-nine".