1216168951 has 2 divisors, whose sum is σ = 1216168952. Its totient is φ = 1216168950.

The previous prime is 1216168939. The next prime is 1216168979. The reversal of 1216168951 is 1598616121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1598616121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216168951 - 2⁷ = 1216168823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216168901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608084475 + 608084476.

It is an arithmetic number, because the mean of its divisors is an integer number (608084476).

Almost surely, 2^1216168951 is an apocalyptic number.

1216168951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216168951 is an equidigital number, since it uses as much as digits as its factorization.

1216168951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 40.

The square root of 1216168951 is about 34873.6139652890. The cubic root of 1216168951 is about 1067.4100902179.

The spelling of 1216168951 in words is "one billion, two hundred sixteen million, one hundred sixty-eight thousand, nine hundred fifty-one".