1203123111 has 12 divisors (see below), whose sum is σ = 1693039032. Its totient is φ = 759866544.

The previous prime is 1203123083. The next prime is 1203123151. The reversal of 1203123111 is 1113213021.

It is a happy number.

It is not a de Polignac number, because 1203123111 - 2¹¹ = 1203121063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203123151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554376 + ... + 556541.

It is an arithmetic number, because the mean of its divisors is an integer number (141086586).

Almost surely, 2^1203123111 is an apocalyptic number.

1203123111 is a deficient number, since it is larger than the sum of its proper divisors (489915921).

1203123111 is a wasteful number, since it uses less digits than its factorization.

1203123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110958 (or 1110939 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1203123111 is about 34686.0650838345. The cubic root of 1203123111 is about 1063.5796596439.

Adding to 1203123111 its reverse (1113213021), we get a palindrome (2316336132).

The spelling of 1203123111 in words is "one billion, two hundred three million, one hundred twenty-three thousand, one hundred eleven".