1216440751 has 2 divisors, whose sum is σ = 1216440752. Its totient is φ = 1216440750.

The previous prime is 1216440739. The next prime is 1216440761. The reversal of 1216440751 is 1570446121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216440751 - 2¹⁹ = 1215916463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216440761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608220375 + 608220376.

It is an arithmetic number, because the mean of its divisors is an integer number (608220376).

Almost surely, 2^1216440751 is an apocalyptic number.

1216440751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216440751 is an equidigital number, since it uses as much as digits as its factorization.

1216440751 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 1216440751 is about 34877.5106766524. The cubic root of 1216440751 is about 1067.4896023207.

Adding to 1216440751 its reverse (1570446121), we get a palindrome (2786886872).

The spelling of 1216440751 in words is "one billion, two hundred sixteen million, four hundred forty thousand, seven hundred fifty-one".