1216615342 has 4 divisors (see below), whose sum is σ = 1824923016. Its totient is φ = 608307670.

The previous prime is 1216615333. The next prime is 1216615343. The reversal of 1216615342 is 2435166121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2435166121 = 67 ⋅36345763.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216615343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304153834 + ... + 304153837.

It is an arithmetic number, because the mean of its divisors is an integer number (456230754).

Almost surely, 2^1216615342 is an apocalyptic number.

1216615342 is a deficient number, since it is larger than the sum of its proper divisors (608307674).

1216615342 is an equidigital number, since it uses as much as digits as its factorization.

1216615342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608307673.

The product of its digits is 8640, while the sum is 31.

The square root of 1216615342 is about 34880.0135034378. The cubic root of 1216615342 is about 1067.5406707516.

The spelling of 1216615342 in words is "one billion, two hundred sixteen million, six hundred fifteen thousand, three hundred forty-two".