31123432111 has 8 divisors (see below), whose sum is σ = 32136495104. Its totient is φ = 30110936760.

The previous prime is 31123432103. The next prime is 31123432177. The reversal of 31123432111 is 11123432113.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31123432111 - 2³ = 31123432103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123432181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29031 + ... + 251176.

It is an arithmetic number, because the mean of its divisors is an integer number (4017061888).

Almost surely, 2^31123432111 is an apocalyptic number.

31123432111 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31123432111 is a deficient number, since it is larger than the sum of its proper divisors (1013062993).

31123432111 is a wasteful number, since it uses less digits than its factorization.

31123432111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283821.

The product of its digits is 432, while the sum is 22.

Adding to 31123432111 its reverse (11123432113), we get a palindrome (42246864224).

The spelling of 31123432111 in words is "thirty-one billion, one hundred twenty-three million, four hundred thirty-two thousand, one hundred eleven".