1420155761 has 2 divisors, whose sum is σ = 1420155762. Its totient is φ = 1420155760.

The previous prime is 1420155743. The next prime is 1420155799. The reversal of 1420155761 is 1675510241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798401536 + 621754225 = 28256^2 + 24935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420155761 - 2⁶ = 1420155697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1420155721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710077880 + 710077881.

It is an arithmetic number, because the mean of its divisors is an integer number (710077881).

Almost surely, 2^1420155761 is an apocalyptic number.

It is an amenable number.

1420155761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420155761 is an equidigital number, since it uses as much as digits as its factorization.

1420155761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 1420155761 is about 37684.9540400410. The cubic root of 1420155761 is about 1124.0319602809.

The spelling of 1420155761 in words is "one billion, four hundred twenty million, one hundred fifty-five thousand, seven hundred sixty-one".