145640531 has 4 divisors (see below), whose sum is σ = 151972752. Its totient is φ = 139308312.

The previous prime is 145640507. The next prime is 145640543. The reversal of 145640531 is 135046541.

It is a happy number.

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 145640531 - 2²⁶ = 78531667 is a prime.

It is a super-2 number, since 2×145640531² = 42422328539923922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145640494 and 145640503.

It is not an unprimeable number, because it can be changed into a prime (145640501) 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, 3166076 + ... + 3166121.

It is an arithmetic number, because the mean of its divisors is an integer number (37993188).

Almost surely, 2^145640531 is an apocalyptic number.

145640531 is a deficient number, since it is larger than the sum of its proper divisors (6332221).

145640531 is an equidigital number, since it uses as much as digits as its factorization.

145640531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6332220.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 145640531 is about 12068.1618732929. The cubic root of 145640531 is about 526.1312339113.

The spelling of 145640531 in words is "one hundred forty-five million, six hundred forty thousand, five hundred thirty-one".