31481743 has 2 divisors, whose sum is σ = 31481744. Its totient is φ = 31481742.

The previous prime is 31481731. The next prime is 31481753. The reversal of 31481743 is 34718413.

It is a strong prime.

It is an emirp because it is prime and its reverse (34718413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31481743 - 2⁵ = 31481711 is a prime.

It is a super-2 number, since 2×31481743² = 1982200284636098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31481713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15740871 + 15740872.

It is an arithmetic number, because the mean of its divisors is an integer number (15740872).

Almost surely, 2^31481743 is an apocalyptic number.

31481743 is a deficient number, since it is larger than the sum of its proper divisors (1).

31481743 is an equidigital number, since it uses as much as digits as its factorization.

31481743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 31481743 is about 5610.8593815921. The cubic root of 31481743 is about 315.7569533943.

The spelling of 31481743 in words is "thirty-one million, four hundred eighty-one thousand, seven hundred forty-three".