1220761 has 2 divisors, whose sum is σ = 1220762. Its totient is φ = 1220760.

The previous prime is 1220743. The next prime is 1220773. The reversal of 1220761 is 1670221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115136 + 105625 = 1056^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220761 - 2⁵ = 1220729 is a prime.

1220761 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1220711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610380 + 610381.

It is an arithmetic number, because the mean of its divisors is an integer number (610381).

2^1220761 is an apocalyptic number.

It is an amenable number.

1220761 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220761 is an equidigital number, since it uses as much as digits as its factorization.

1220761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1220761 is about 1104.8805365287. The cubic root of 1220761 is about 106.8751856408.

Adding to 1220761 its reverse (1670221), we get a palindrome (2890982).

The spelling of 1220761 in words is "one million, two hundred twenty thousand, seven hundred sixty-one".