1245120155 has 4 divisors (see below), whose sum is σ = 1494144192. Its totient is φ = 996096120.

The previous prime is 1245120131. The next prime is 1245120167. The reversal of 1245120155 is 5510215421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1245120155 - 2⁶ = 1245120091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124512011 + ... + 124512020.

It is an arithmetic number, because the mean of its divisors is an integer number (373536048).

Almost surely, 2^1245120155 is an apocalyptic number.

1245120155 is a deficient number, since it is larger than the sum of its proper divisors (249024037).

1245120155 is an equidigital number, since it uses as much as digits as its factorization.

1245120155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249024036.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1245120155 is about 35286.2601447079. The cubic root of 1245120155 is about 1075.8137426184.

Adding to 1245120155 its reverse (5510215421), we get a palindrome (6755335576).

The spelling of 1245120155 in words is "one billion, two hundred forty-five million, one hundred twenty thousand, one hundred fifty-five".