145521457 has 2 divisors, whose sum is σ = 145521458. Its totient is φ = 145521456.

The previous prime is 145521443. The next prime is 145521469. The reversal of 145521457 is 754125541.

145521457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115971361 + 29550096 = 10769^2 + 5436^2 .

It is a cyclic number.

It is not a de Polignac number, because 145521457 - 2¹⁵ = 145488689 is a prime.

It is not a weakly prime, because it can be changed into another prime (145521557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72760728 + 72760729.

It is an arithmetic number, because the mean of its divisors is an integer number (72760729).

Almost surely, 2^145521457 is an apocalyptic number.

It is an amenable number.

145521457 is a deficient number, since it is larger than the sum of its proper divisors (1).

145521457 is an equidigital number, since it uses as much as digits as its factorization.

145521457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28000, while the sum is 34.

The square root of 145521457 is about 12063.2274702917. The cubic root of 145521457 is about 525.9878085624.

Adding to 145521457 its reverse (754125541), we get a palindrome (899646998).

The spelling of 145521457 in words is "one hundred forty-five million, five hundred twenty-one thousand, four hundred fifty-seven".