845142031 has 2 divisors, whose sum is σ = 845142032. Its totient is φ = 845142030.

The previous prime is 845141987. The next prime is 845142037. The reversal of 845142031 is 130241548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-845142031 is a prime.

It is a super-2 number, since 2×845142031² = 1428530105125609922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (845142037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422571015 + 422571016.

It is an arithmetic number, because the mean of its divisors is an integer number (422571016).

Almost surely, 2^845142031 is an apocalyptic number.

845142031 is a deficient number, since it is larger than the sum of its proper divisors (1).

845142031 is an equidigital number, since it uses as much as digits as its factorization.

845142031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 845142031 is about 29071.3266123168. The cubic root of 845142031 is about 945.4601609126.

Adding to 845142031 its reverse (130241548), we get a palindrome (975383579).

The spelling of 845142031 in words is "eight hundred forty-five million, one hundred forty-two thousand, thirty-one".