31400143 has 2 divisors, whose sum is σ = 31400144. Its totient is φ = 31400142.

The previous prime is 31400123. The next prime is 31400167. The reversal of 31400143 is 34100413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31400143 - 2¹³ = 31391951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31400123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700071 + 15700072.

It is an arithmetic number, because the mean of its divisors is an integer number (15700072).

Almost surely, 2^31400143 is an apocalyptic number.

31400143 is a deficient number, since it is larger than the sum of its proper divisors (1).

31400143 is an equidigital number, since it uses as much as digits as its factorization.

31400143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31400143 is about 5603.5830501564. The cubic root of 31400143 is about 315.4839056055.

Adding to 31400143 its reverse (34100413), we get a palindrome (65500556).

The spelling of 31400143 in words is "thirty-one million, four hundred thousand, one hundred forty-three".