145561513 has 2 divisors, whose sum is σ = 145561514. Its totient is φ = 145561512.

The previous prime is 145561511. The next prime is 145561571. The reversal of 145561513 is 315165541.

It is a happy number.

145561513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138015504 + 7546009 = 11748^2 + 2747^2 .

It is a cyclic number.

It is not a de Polignac number, because 145561513 - 2¹ = 145561511 is a prime.

Together with 145561511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (145561511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72780756 + 72780757.

It is an arithmetic number, because the mean of its divisors is an integer number (72780757).

Almost surely, 2^145561513 is an apocalyptic number.

It is an amenable number.

145561513 is a deficient number, since it is larger than the sum of its proper divisors (1).

145561513 is an equidigital number, since it uses as much as digits as its factorization.

145561513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 31.

The square root of 145561513 is about 12064.8876082623. The cubic root of 145561513 is about 526.0360649851.

The spelling of 145561513 in words is "one hundred forty-five million, five hundred sixty-one thousand, five hundred thirteen".