145451639 has 2 divisors, whose sum is σ = 145451640. Its totient is φ = 145451638.

The previous prime is 145451599. The next prime is 145451689. The reversal of 145451639 is 936154541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145451639 - 2²⁴ = 128674423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145451689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72725819 + 72725820.

It is an arithmetic number, because the mean of its divisors is an integer number (72725820).

Almost surely, 2^145451639 is an apocalyptic number.

145451639 is a deficient number, since it is larger than the sum of its proper divisors (1).

145451639 is an equidigital number, since it uses as much as digits as its factorization.

145451639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 38.

The square root of 145451639 is about 12060.3332872686. Note that the first 3 decimals coincide. The cubic root of 145451639 is about 525.9036759720.

The spelling of 145451639 in words is "one hundred forty-five million, four hundred fifty-one thousand, six hundred thirty-nine".