845131387 has 4 divisors (see below), whose sum is σ = 894845016. Its totient is φ = 795417760.

The previous prime is 845131361. The next prime is 845131403. The reversal of 845131387 is 783131548.

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

It is not a de Polignac number, because 845131387 - 2¹⁵ = 845098619 is a prime.

It is a super-2 number, since 2×845131387² = 1428494122585087538, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (845111387) 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, 24856789 + ... + 24856822.

It is an arithmetic number, because the mean of its divisors is an integer number (223711254).

Almost surely, 2^845131387 is an apocalyptic number.

845131387 is a deficient number, since it is larger than the sum of its proper divisors (49713629).

845131387 is a wasteful number, since it uses less digits than its factorization.

845131387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49713628.

The product of its digits is 80640, while the sum is 40.

The square root of 845131387 is about 29071.1435447593. The cubic root of 845131387 is about 945.4561917493.

The spelling of 845131387 in words is "eight hundred forty-five million, one hundred thirty-one thousand, three hundred eighty-seven".