1231550773 has 2 divisors, whose sum is σ = 1231550774. Its totient is φ = 1231550772.

The previous prime is 1231550753. The next prime is 1231550791. The reversal of 1231550773 is 3770551321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 947223729 + 284327044 = 30777^2 + 16862^2 .

It is an emirp because it is prime and its reverse (3770551321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231550773 - 2²⁹ = 694679861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231550753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615775386 + 615775387.

It is an arithmetic number, because the mean of its divisors is an integer number (615775387).

Almost surely, 2^1231550773 is an apocalyptic number.

It is an amenable number.

1231550773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231550773 is an equidigital number, since it uses as much as digits as its factorization.

1231550773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 34.

The square root of 1231550773 is about 35093.4576951317. The cubic root of 1231550773 is about 1071.8913684405.

The spelling of 1231550773 in words is "one billion, two hundred thirty-one million, five hundred fifty thousand, seven hundred seventy-three".