1245323155 has 32 divisors (see below), whose sum is σ = 1586148480. Its totient is φ = 936714240.

The previous prime is 1245323143. The next prime is 1245323159. The reversal of 1245323155 is 5513235421.

It is not a de Polignac number, because 1245323155 - 2²¹ = 1243226003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245323159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2875819 + ... + 2876251.

It is an arithmetic number, because the mean of its divisors is an integer number (49567140).

Almost surely, 2^1245323155 is an apocalyptic number.

1245323155 is a deficient number, since it is larger than the sum of its proper divisors (340825325).

1245323155 is a wasteful number, since it uses less digits than its factorization.

1245323155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831.

The product of its digits is 18000, while the sum is 31.

The square root of 1245323155 is about 35289.1365011954. The cubic root of 1245323155 is about 1075.8722050678.

Adding to 1245323155 its reverse (5513235421), we get a palindrome (6758558576).

The spelling of 1245323155 in words is "one billion, two hundred forty-five million, three hundred twenty-three thousand, one hundred fifty-five".