1200123131 has 2 divisors, whose sum is σ = 1200123132. Its totient is φ = 1200123130.

The previous prime is 1200123103. The next prime is 1200123137. The reversal of 1200123131 is 1313210021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1200123131 - 2²² = 1195928827 is a prime.

It is a super-2 number, since 2×1200123131² = 2880591059122486322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200123137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600061565 + 600061566.

It is an arithmetic number, because the mean of its divisors is an integer number (600061566).

Almost surely, 2^1200123131 is an apocalyptic number.

1200123131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200123131 is an equidigital number, since it uses as much as digits as its factorization.

1200123131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1200123131 is about 34642.7933486894. The cubic root of 1200123131 is about 1062.6949141096.

Adding to 1200123131 its reverse (1313210021), we get a palindrome (2513333152).

The spelling of 1200123131 in words is "one billion, two hundred million, one hundred twenty-three thousand, one hundred thirty-one".