1250220155 has 4 divisors (see below), whose sum is σ = 1500264192. Its totient is φ = 1000176120.

The previous prime is 1250220149. The next prime is 1250220187. The reversal of 1250220155 is 5510220521.

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

It is not a de Polignac number, because 1250220155 - 2⁶ = 1250220091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1250220155.

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, 125022011 + ... + 125022020.

It is an arithmetic number, because the mean of its divisors is an integer number (375066048).

Almost surely, 2^1250220155 is an apocalyptic number.

1250220155 is a deficient number, since it is larger than the sum of its proper divisors (250044037).

1250220155 is an equidigital number, since it uses as much as digits as its factorization.

1250220155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250044036.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 1250220155 is about 35358.4523841189. The cubic root of 1250220155 is about 1077.2805825794.

Adding to 1250220155 its reverse (5510220521), we get a palindrome (6760440676).

The spelling of 1250220155 in words is "one billion, two hundred fifty million, two hundred twenty thousand, one hundred fifty-five".