145311031 has 4 divisors (see below), whose sum is σ = 152959000. Its totient is φ = 137663064.

The previous prime is 145310989. The next prime is 145311059. The reversal of 145311031 is 130113541.

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

It is a cyclic number.

It is not a de Polignac number, because 145311031 - 2²⁵ = 111756599 is a prime.

It is a super-2 number, since 2×145311031² = 42230591460565922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 7647949 = 145311031 / (1 + 4 + 5 + 3 + 1 + 1 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145311931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3823956 + ... + 3823993.

It is an arithmetic number, because the mean of its divisors is an integer number (38239750).

Almost surely, 2^145311031 is an apocalyptic number.

145311031 is a deficient number, since it is larger than the sum of its proper divisors (7647969).

145311031 is an equidigital number, since it uses as much as digits as its factorization.

145311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7647968.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 145311031 is about 12054.5025198056. The cubic root of 145311031 is about 525.7341577612.

Adding to 145311031 its reverse (130113541), we get a palindrome (275424572).

The spelling of 145311031 in words is "one hundred forty-five million, three hundred eleven thousand, thirty-one".