1223155245 has 24 divisors (see below), whose sum is σ = 2119175136. Its totient is φ = 602167488.

The previous prime is 1223155231. The next prime is 1223155247. The reversal of 1223155245 is 5425513221.

It is not a de Polignac number, because 1223155245 - 2²¹ = 1221058093 is a prime.

It is a super-2 number, since 2×1223155245² = 2992217506742020050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223155247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238719 + ... + 243788.

It is an arithmetic number, because the mean of its divisors is an integer number (88298964).

Almost surely, 2^1223155245 is an apocalyptic number.

1223155245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1223155245 is a deficient number, since it is larger than the sum of its proper divisors (896019891).

1223155245 is a wasteful number, since it uses less digits than its factorization.

1223155245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482541 (or 482528 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 1223155245 is about 34973.6364280296. The cubic root of 1223155245 is about 1069.4501046702.

Adding to 1223155245 its reverse (5425513221), we get a palindrome (6648668466).

It can be divided in two parts, 12231 and 55245, that added together give a palindrome (67476).

The spelling of 1223155245 in words is "one billion, two hundred twenty-three million, one hundred fifty-five thousand, two hundred forty-five".