145523731 has 2 divisors, whose sum is σ = 145523732. Its totient is φ = 145523730.

The previous prime is 145523713. The next prime is 145523759. The reversal of 145523731 is 137325541.

It is a happy number.

Together with previous prime (145523713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145523731 - 2²¹ = 143426579 is a prime.

It is a super-3 number, since 3×145523731³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 145523693 and 145523702.

It is not a weakly prime, because it can be changed into another prime (145521731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72761865 + 72761866.

It is an arithmetic number, because the mean of its divisors is an integer number (72761866).

Almost surely, 2^145523731 is an apocalyptic number.

145523731 is a deficient number, since it is larger than the sum of its proper divisors (1).

145523731 is an equidigital number, since it uses as much as digits as its factorization.

145523731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 31.

The square root of 145523731 is about 12063.3217233066. The cubic root of 145523731 is about 525.9905483418.

The spelling of 145523731 in words is "one hundred forty-five million, five hundred twenty-three thousand, seven hundred thirty-one".