1351123555 has 4 divisors (see below), whose sum is σ = 1621348272. Its totient is φ = 1080898840.

The previous prime is 1351123531. The next prime is 1351123559. The reversal of 1351123555 is 5553211531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5553211531 = 7 ⋅793315933.

It is not a de Polignac number, because 1351123555 - 2²³ = 1342734947 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1351123559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135112351 + ... + 135112360.

It is an arithmetic number, because the mean of its divisors is an integer number (405337068).

Almost surely, 2^1351123555 is an apocalyptic number.

1351123555 is a deficient number, since it is larger than the sum of its proper divisors (270224717).

1351123555 is an equidigital number, since it uses as much as digits as its factorization.

1351123555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270224716.

The product of its digits is 11250, while the sum is 31.

The square root of 1351123555 is about 36757.6326087522. The cubic root of 1351123555 is about 1105.5159728689.

The spelling of 1351123555 in words is "one billion, three hundred fifty-one million, one hundred twenty-three thousand, five hundred fifty-five".