145831131 has 8 divisors (see below), whose sum is σ = 216046160. Its totient is φ = 97220736.

The previous prime is 145831123. The next prime is 145831163. The reversal of 145831131 is 131138541.

145831131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 145831131 - 2³ = 145831123 is a prime.

It is a super-2 number, since 2×145831131² = 42533437537478322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 5401153 = 145831131 / (1 + 4 + 5 + 8 + 3 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145831095 and 145831104.

It is not an unprimeable number, because it can be changed into a prime (145831181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2700550 + ... + 2700603.

It is an arithmetic number, because the mean of its divisors is an integer number (27005770).

Almost surely, 2^145831131 is an apocalyptic number.

145831131 is a deficient number, since it is larger than the sum of its proper divisors (70215029).

145831131 is an equidigital number, since it uses as much as digits as its factorization.

145831131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401162 (or 5401156 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 145831131 is about 12076.0561028839. The cubic root of 145831131 is about 526.3606501286.

Adding to 145831131 its reverse (131138541), we get a palindrome (276969672).

The spelling of 145831131 in words is "one hundred forty-five million, eight hundred thirty-one thousand, one hundred thirty-one".