1247162145 has 32 divisors (see below), whose sum is σ = 2053349760. Its totient is φ = 645926400.

The previous prime is 1247162093. The next prime is 1247162159. The reversal of 1247162145 is 5412617421.

It is not a de Polignac number, because 1247162145 - 2¹³ = 1247153953 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 331686 + ... + 335424.

It is an arithmetic number, because the mean of its divisors is an integer number (64167180).

Almost surely, 2^1247162145 is an apocalyptic number.

1247162145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1247162145 is a deficient number, since it is larger than the sum of its proper divisors (806187615).

1247162145 is a wasteful number, since it uses less digits than its factorization.

1247162145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4385.

The product of its digits is 13440, while the sum is 33.

The square root of 1247162145 is about 35315.1829246289. The cubic root of 1247162145 is about 1076.4015308932.

Adding to 1247162145 its reverse (5412617421), we get a palindrome (6659779566).

The spelling of 1247162145 in words is "one billion, two hundred forty-seven million, one hundred sixty-two thousand, one hundred forty-five".