1216016251 has 2 divisors, whose sum is σ = 1216016252. Its totient is φ = 1216016250.

The previous prime is 1216016227. The next prime is 1216016287. The reversal of 1216016251 is 1526106121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216016251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216016201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608008125 + 608008126.

It is an arithmetic number, because the mean of its divisors is an integer number (608008126).

Almost surely, 2^1216016251 is an apocalyptic number.

1216016251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216016251 is an equidigital number, since it uses as much as digits as its factorization.

1216016251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1216016251 is about 34871.4245622401. The cubic root of 1216016251 is about 1067.3654143136.

The spelling of 1216016251 in words is "one billion, two hundred sixteen million, sixteen thousand, two hundred fifty-one".