1261772363 has 2 divisors, whose sum is σ = 1261772364. Its totient is φ = 1261772362.

The previous prime is 1261772359. The next prime is 1261772371. The reversal of 1261772363 is 3632771621.

It is a weak prime.

It is an emirp because it is prime and its reverse (3632771621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261772363 - 2² = 1261772359 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261772353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630886181 + 630886182.

It is an arithmetic number, because the mean of its divisors is an integer number (630886182).

Almost surely, 2^1261772363 is an apocalyptic number.

1261772363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261772363 is an equidigital number, since it uses as much as digits as its factorization.

1261772363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 38.

The square root of 1261772363 is about 35521.4352609801. The cubic root of 1261772363 is about 1080.5884890037.

The spelling of 1261772363 in words is "one billion, two hundred sixty-one million, seven hundred seventy-two thousand, three hundred sixty-three".