845772131 has 2 divisors, whose sum is σ = 845772132. Its totient is φ = 845772130.

The previous prime is 845772107. The next prime is 845772143. The reversal of 845772131 is 131277548.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 845772131 - 2¹⁰ = 845771107 is a prime.

It is a super-2 number, since 2×845772131² = 1430660995152562322, which contains 22 as substring.

It is a Chen prime.

It is equal to p_43376276 and since 845772131 and 43376276 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (845772331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422886065 + 422886066.

It is an arithmetic number, because the mean of its divisors is an integer number (422886066).

Almost surely, 2^845772131 is an apocalyptic number.

845772131 is a deficient number, since it is larger than the sum of its proper divisors (1).

845772131 is an equidigital number, since it uses as much as digits as its factorization.

845772131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 845772131 is about 29082.1617318933. The cubic root of 845772131 is about 945.6950667768.

The spelling of 845772131 in words is "eight hundred forty-five million, seven hundred seventy-two thousand, one hundred thirty-one".