1220742751 has 2 divisors, whose sum is σ = 1220742752. Its totient is φ = 1220742750.

The previous prime is 1220742727. The next prime is 1220742773. The reversal of 1220742751 is 1572470221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220742751 - 2¹⁹ = 1220218463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220742151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610371375 + 610371376.

It is an arithmetic number, because the mean of its divisors is an integer number (610371376).

Almost surely, 2^1220742751 is an apocalyptic number.

1220742751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220742751 is an equidigital number, since it uses as much as digits as its factorization.

1220742751 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 1220742751 is about 34939.1292249821. The cubic root of 1220742751 is about 1068.7465308370.

The spelling of 1220742751 in words is "one billion, two hundred twenty million, seven hundred forty-two thousand, seven hundred fifty-one".