855607531 has 2 divisors, whose sum is σ = 855607532. Its totient is φ = 855607530.

The previous prime is 855607513. The next prime is 855607537. The reversal of 855607531 is 135706558.

Together with previous prime (855607513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 855607531 - 2¹¹ = 855605483 is a prime.

It is a super-2 number, since 2×855607531² = 1464128494207831922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (855607537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427803765 + 427803766.

It is an arithmetic number, because the mean of its divisors is an integer number (427803766).

Almost surely, 2^855607531 is an apocalyptic number.

855607531 is a deficient number, since it is larger than the sum of its proper divisors (1).

855607531 is an equidigital number, since it uses as much as digits as its factorization.

855607531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 40.

The square root of 855607531 is about 29250.7697505553. The cubic root of 855607531 is about 949.3467461008.

The spelling of 855607531 in words is "eight hundred fifty-five million, six hundred seven thousand, five hundred thirty-one".