1311100245 has 96 divisors (see below), whose sum is σ = 2808029952. Its totient is φ = 551079936.

The previous prime is 1311100243. The next prime is 1311100247. The reversal of 1311100245 is 5420011131.

It is an interprime number because it is at equal distance from previous prime (1311100243) and next prime (1311100247).

It is not a de Polignac number, because 1311100245 - 2¹ = 1311100243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311100243) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1445082 + ... + 1445988.

It is an arithmetic number, because the mean of its divisors is an integer number (29250312).

Almost surely, 2^1311100245 is an apocalyptic number.

1311100245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1311100245 is an abundant number, since it is smaller than the sum of its proper divisors (1496929707).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311100245 is a wasteful number, since it uses less digits than its factorization.

1311100245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1288 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1311100245 is about 36209.1182576986. The cubic root of 1311100245 is about 1094.4904240596.

Adding to 1311100245 its reverse (5420011131), we get a palindrome (6731111376).

The spelling of 1311100245 in words is "one billion, three hundred eleven million, one hundred thousand, two hundred forty-five".