1772272561 has 4 divisors (see below), whose sum is σ = 1772736624. Its totient is φ = 1771808500.

The previous prime is 1772272531. The next prime is 1772272591. The reversal of 1772272561 is 1652722771.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1772272531) and next prime (1772272591).

It is a cyclic number.

It is not a de Polignac number, because 1772272561 - 2²⁷ = 1638054833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1772272531) 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 in 3 ways as a sum of consecutive naturals, for example, 226255 + ... + 233956.

It is an arithmetic number, because the mean of its divisors is an integer number (443184156).

Almost surely, 2^1772272561 is an apocalyptic number.

It is an amenable number.

1772272561 is a deficient number, since it is larger than the sum of its proper divisors (464063).

1772272561 is an equidigital number, since it uses as much as digits as its factorization.

1772272561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464062.

The product of its digits is 82320, while the sum is 40.

The square root of 1772272561 is about 42098.3676761938. The cubic root of 1772272561 is about 1210.1619802275.

The spelling of 1772272561 in words is "one billion, seven hundred seventy-two million, two hundred seventy-two thousand, five hundred sixty-one".