1213542135 has 64 divisors (see below), whose sum is σ = 2336947200. Its totient is φ = 593944704.

The previous prime is 1213542107. The next prime is 1213542157. The reversal of 1213542135 is 5312453121.

It is not a de Polignac number, because 1213542135 - 2¹³ = 1213533943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1213542099 and 1213542108.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 312214 + ... + 316076.

It is an arithmetic number, because the mean of its divisors is an integer number (36514800).

Almost surely, 2^1213542135 is an apocalyptic number.

1213542135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213542135 is a deficient number, since it is larger than the sum of its proper divisors (1123405065).

1213542135 is a wasteful number, since it uses less digits than its factorization.

1213542135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069 (or 4063 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1213542135 is about 34835.9316654514. The cubic root of 1213542135 is about 1066.6410328584.

Adding to 1213542135 its reverse (5312453121), we get a palindrome (6525995256).

The spelling of 1213542135 in words is "one billion, two hundred thirteen million, five hundred forty-two thousand, one hundred thirty-five".