145623521 has 2 divisors, whose sum is σ = 145623522. Its totient is φ = 145623520.

The previous prime is 145623497. The next prime is 145623553. The reversal of 145623521 is 125326541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122965921 + 22657600 = 11089^2 + 4760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145623521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145623421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72811760 + 72811761.

It is an arithmetic number, because the mean of its divisors is an integer number (72811761).

Almost surely, 2^145623521 is an apocalyptic number.

It is an amenable number.

145623521 is a deficient number, since it is larger than the sum of its proper divisors (1).

145623521 is an equidigital number, since it uses as much as digits as its factorization.

145623521 is an evil number, because the sum of its binary digits is even.

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

The square root of 145623521 is about 12067.4571057866. The cubic root of 145623521 is about 526.1107500513.

The spelling of 145623521 in words is "one hundred forty-five million, six hundred twenty-three thousand, five hundred twenty-one".