845420531 has 4 divisors (see below), whose sum is σ = 846846792. Its totient is φ = 843994272.

The previous prime is 845420507. The next prime is 845420551. The reversal of 845420531 is 135024548.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 845420531 - 2²² = 841226227 is a prime.

It is a super-2 number, since 2×845420531² = 1429471748472643922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845420551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712241 + ... + 713426.

It is an arithmetic number, because the mean of its divisors is an integer number (211711698).

Almost surely, 2^845420531 is an apocalyptic number.

845420531 is a deficient number, since it is larger than the sum of its proper divisors (1426261).

845420531 is a wasteful number, since it uses less digits than its factorization.

845420531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426260.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 845420531 is about 29076.1161608630. The cubic root of 845420531 is about 945.5640021319.

The spelling of 845420531 in words is "eight hundred forty-five million, four hundred twenty thousand, five hundred thirty-one".