31420009 has 2 divisors, whose sum is σ = 31420010. Its totient is φ = 31420008.

The previous prime is 31419979. The next prime is 31420027. The reversal of 31420009 is 90002413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26491609 + 4928400 = 5147^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 31420009 - 2¹³ = 31411817 is a prime.

It is not a weakly prime, because it can be changed into another prime (31420069) 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, 15710004 + 15710005.

It is an arithmetic number, because the mean of its divisors is an integer number (15710005).

Almost surely, 2^31420009 is an apocalyptic number.

It is an amenable number.

31420009 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420009 is an equidigital number, since it uses as much as digits as its factorization.

31420009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31420009 is about 5605.3553857004. The cubic root of 31420009 is about 315.5504242197.

It can be divided in two parts, 314 and 20009, that multiplied together give a palindrome (6282826).

The spelling of 31420009 in words is "thirty-one million, four hundred twenty thousand, nine".