145387231 has 4 divisors (see below), whose sum is σ = 158604264. Its totient is φ = 132170200.

The previous prime is 145387223. The next prime is 145387243. The reversal of 145387231 is 132783541.

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 145387231 - 2³ = 145387223 is a prime.

It is a super-2 number, since 2×145387231² = 42274893875694722, 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 (145387261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6608500 + ... + 6608521.

It is an arithmetic number, because the mean of its divisors is an integer number (39651066).

Almost surely, 2^145387231 is an apocalyptic number.

145387231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145387231 is a deficient number, since it is larger than the sum of its proper divisors (13217033).

145387231 is a wasteful number, since it uses less digits than its factorization.

145387231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13217032.

The product of its digits is 20160, while the sum is 34.

The square root of 145387231 is about 12057.6627503012. The cubic root of 145387231 is about 525.8260387011.

The spelling of 145387231 in words is "one hundred forty-five million, three hundred eighty-seven thousand, two hundred thirty-one".