31143319 has 4 divisors (see below), whose sum is σ = 31170744. Its totient is φ = 31115896.

The previous prime is 31143317. The next prime is 31143323. The reversal of 31143319 is 91334113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31143319 - 2¹ = 31143317 is a prime.

It is a super-2 number, since 2×31143319² = 1939812636671522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31143293 and 31143302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11932 + ... + 14305.

It is an arithmetic number, because the mean of its divisors is an integer number (7792686).

It is a self-describing number.

Almost surely, 2^31143319 is an apocalyptic number.

31143319 is a deficient number, since it is larger than the sum of its proper divisors (27425).

31143319 is a wasteful number, since it uses less digits than its factorization.

31143319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27424.

The product of its digits is 972, while the sum is 25.

The square root of 31143319 is about 5580.6199476402. The cubic root of 31143319 is about 314.6214281348.

The spelling of 31143319 in words is "thirty-one million, one hundred forty-three thousand, three hundred nineteen".