1216154839 has 2 divisors, whose sum is σ = 1216154840. Its totient is φ = 1216154838.

The previous prime is 1216154803. The next prime is 1216154867. The reversal of 1216154839 is 9384516121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216154839 - 2⁹ = 1216154327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216154039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608077419 + 608077420.

It is an arithmetic number, because the mean of its divisors is an integer number (608077420).

Almost surely, 2^1216154839 is an apocalyptic number.

1216154839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216154839 is an equidigital number, since it uses as much as digits as its factorization.

1216154839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 1216154839 is about 34873.4116340802. The cubic root of 1216154839 is about 1067.4059615838.

The spelling of 1216154839 in words is "one billion, two hundred sixteen million, one hundred fifty-four thousand, eight hundred thirty-nine".