1215452773 has 2 divisors, whose sum is σ = 1215452774. Its totient is φ = 1215452772.

The previous prime is 1215452761. The next prime is 1215452783. The reversal of 1215452773 is 3772545121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1115092449 + 100360324 = 33393^2 + 10018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215452773 - 2⁵ = 1215452741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215452713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607726386 + 607726387.

It is an arithmetic number, because the mean of its divisors is an integer number (607726387).

Almost surely, 2^1215452773 is an apocalyptic number.

It is an amenable number.

1215452773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215452773 is an equidigital number, since it uses as much as digits as its factorization.

1215452773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 37.

The square root of 1215452773 is about 34863.3442601251. The cubic root of 1215452773 is about 1067.2005234660.

Adding to 1215452773 its reverse (3772545121), we get a palindrome (4987997894).

The spelling of 1215452773 in words is "one billion, two hundred fifteen million, four hundred fifty-two thousand, seven hundred seventy-three".