31421111 has 2 divisors, whose sum is σ = 31421112. Its totient is φ = 31421110.

The previous prime is 31421107. The next prime is 31421141. The reversal of 31421111 is 11112413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31421111 - 2² = 31421107 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31421101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15710555 + 15710556.

It is an arithmetic number, because the mean of its divisors is an integer number (15710556).

Almost surely, 2^31421111 is an apocalyptic number.

31421111 is a deficient number, since it is larger than the sum of its proper divisors (1).

31421111 is an equidigital number, since it uses as much as digits as its factorization.

31421111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24, while the sum is 14.

The square root of 31421111 is about 5605.4536836906. The cubic root of 31421111 is about 315.5541132967.

Adding to 31421111 its reverse (11112413), we get a palindrome (42533524).

The spelling of 31421111 in words is "thirty-one million, four hundred twenty-one thousand, one hundred eleven".