1215345542 has 4 divisors (see below), whose sum is σ = 1823018316. Its totient is φ = 607672770.

The previous prime is 1215345503. The next prime is 1215345563. The reversal of 1215345542 is 2455435121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2455435121 = 3407 ⋅720703.

It is a junction number, because it is equal to n+sod(n) for n = 1215345499 and 1215345508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303836384 + ... + 303836387.

It is an arithmetic number, because the mean of its divisors is an integer number (455754579).

Almost surely, 2^1215345542 is an apocalyptic number.

1215345542 is a deficient number, since it is larger than the sum of its proper divisors (607672774).

1215345542 is an equidigital number, since it uses as much as digits as its factorization.

1215345542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607672773.

The product of its digits is 24000, while the sum is 32.

The square root of 1215345542 is about 34861.8063502166. The cubic root of 1215345542 is about 1067.1691386336.

The spelling of 1215345542 in words is "one billion, two hundred fifteen million, three hundred forty-five thousand, five hundred forty-two".