31143123 has 48 divisors (see below), whose sum is σ = 51996672. Its totient is φ = 18468000.

The previous prime is 31143113. The next prime is 31143157. The reversal of 31143123 is 32134113.

It is not a de Polignac number, because 31143123 - 2⁹ = 31142611 is a prime.

It is a super-2 number, since 2×31143123² = 1939788220386258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31143096 and 31143105.

It is not an unprimeable number, because it can be changed into a prime (31143103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 162958 + ... + 163148.

It is an arithmetic number, because the mean of its divisors is an integer number (1083264).

Almost surely, 2^31143123 is an apocalyptic number.

31143123 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

31143123 is a deficient number, since it is larger than the sum of its proper divisors (20853549).

31143123 is a wasteful number, since it uses less digits than its factorization.

31143123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 266 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 31143123 is about 5580.6023868396. The cubic root of 31143123 is about 314.6207681117.

Adding to 31143123 its reverse (32134113), we get a palindrome (63277236).

It can be divided in two parts, 311 and 43123, that added together give a palindrome (43434).

The spelling of 31143123 in words is "thirty-one million, one hundred forty-three thousand, one hundred twenty-three".