855773531 has 2 divisors, whose sum is σ = 855773532. Its totient is φ = 855773530.

The previous prime is 855773519. The next prime is 855773539. The reversal of 855773531 is 135377558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855773531 - 2⁶ = 855773467 is a prime.

It is a super-2 number, since 2×855773531² = 1464696672720415922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (855773539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427886765 + 427886766.

It is an arithmetic number, because the mean of its divisors is an integer number (427886766).

Almost surely, 2^855773531 is an apocalyptic number.

855773531 is a deficient number, since it is larger than the sum of its proper divisors (1).

855773531 is an equidigital number, since it uses as much as digits as its factorization.

855773531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 441000, while the sum is 44.

The square root of 855773531 is about 29253.6071451026. The cubic root of 855773531 is about 949.4081377099.

The spelling of 855773531 in words is "eight hundred fifty-five million, seven hundred seventy-three thousand, five hundred thirty-one".