1772718949 has 2 divisors, whose sum is σ = 1772718950. Its totient is φ = 1772718948.

The previous prime is 1772718919. The next prime is 1772718991. The reversal of 1772718949 is 9498172771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1558828324 + 213890625 = 39482^2 + 14625^2 .

It is a cyclic number.

It is not a de Polignac number, because 1772718949 - 2⁵ = 1772718917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1772718949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1772718919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 886359474 + 886359475.

It is an arithmetic number, because the mean of its divisors is an integer number (886359475).

Almost surely, 2^1772718949 is an apocalyptic number.

It is an amenable number.

1772718949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1772718949 is an equidigital number, since it uses as much as digits as its factorization.

1772718949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 55.

The square root of 1772718949 is about 42103.6690681465. The cubic root of 1772718949 is about 1210.2635741640.

The spelling of 1772718949 in words is "one billion, seven hundred seventy-two million, seven hundred eighteen thousand, nine hundred forty-nine".