1151221751 has 2 divisors, whose sum is σ = 1151221752. Its totient is φ = 1151221750.

The previous prime is 1151221727. The next prime is 1151221777. The reversal of 1151221751 is 1571221511.

It is an a-pointer prime, because the next prime (1151221777) can be obtained adding 1151221751 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1151221751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1151221751.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151221151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575610875 + 575610876.

It is an arithmetic number, because the mean of its divisors is an integer number (575610876).

Almost surely, 2^1151221751 is an apocalyptic number.

1151221751 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151221751 is an equidigital number, since it uses as much as digits as its factorization.

1151221751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 700, while the sum is 26.

The square root of 1151221751 is about 33929.6588694906. The cubic root of 1151221751 is about 1048.0604409206.

The spelling of 1151221751 in words is "one billion, one hundred fifty-one million, two hundred twenty-one thousand, seven hundred fifty-one".