1255520123 has 16 divisors (see below), whose sum is σ = 1479450336. Its totient is φ = 1050416640.

The previous prime is 1255520111. The next prime is 1255520129. The reversal of 1255520123 is 3210255521.

It is not a de Polignac number, because 1255520123 - 2¹⁶ = 1255454587 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1255520092 and 1255520101.

It is not an unprimeable number, because it can be changed into a prime (1255520129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35165 + ... + 61217.

It is an arithmetic number, because the mean of its divisors is an integer number (92465646).

Almost surely, 2^1255520123 is an apocalyptic number.

1255520123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1255520123 is a deficient number, since it is larger than the sum of its proper divisors (223930213).

1255520123 is a wasteful number, since it uses less digits than its factorization.

1255520123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26414.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1255520123 is about 35433.3193900882. The cubic root of 1255520123 is about 1078.8007157891.

Adding to 1255520123 its reverse (3210255521), we get a palindrome (4465775644).

The spelling of 1255520123 in words is "one billion, two hundred fifty-five million, five hundred twenty thousand, one hundred twenty-three".