145891031 has 24 divisors (see below), whose sum is σ = 174059760. Its totient is φ = 121461120.

The previous prime is 145891027. The next prime is 145891043. The reversal of 145891031 is 130198541.

It is not a de Polignac number, because 145891031 - 2² = 145891027 is a prime.

It is a super-2 number, since 2×145891031² = 42568385852485922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145891051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256115 + ... + 256683.

It is an arithmetic number, because the mean of its divisors is an integer number (7252490).

Almost surely, 2^145891031 is an apocalyptic number.

145891031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145891031 is a deficient number, since it is larger than the sum of its proper divisors (28168729).

145891031 is a wasteful number, since it uses less digits than its factorization.

145891031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 145891031 is about 12078.5359626074. The cubic root of 145891031 is about 526.4327076445.

The spelling of 145891031 in words is "one hundred forty-five million, eight hundred ninety-one thousand, thirty-one".