1201555123 has 2 divisors, whose sum is σ = 1201555124. Its totient is φ = 1201555122.

The previous prime is 1201555097. The next prime is 1201555139. The reversal of 1201555123 is 3215551021.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201555123 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201555183) 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, 600777561 + 600777562.

It is an arithmetic number, because the mean of its divisors is an integer number (600777562).

Almost surely, 2^1201555123 is an apocalyptic number.

1201555123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201555123 is an equidigital number, since it uses as much as digits as its factorization.

1201555123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 1201555123 is about 34663.4551509223. The cubic root of 1201555123 is about 1063.1174168001.

The spelling of 1201555123 in words is "one billion, two hundred one million, five hundred fifty-five thousand, one hundred twenty-three".