145021399 has 2 divisors, whose sum is σ = 145021400. Its totient is φ = 145021398.

The previous prime is 145021391. The next prime is 145021403. The reversal of 145021399 is 993120541.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 145021399 - 2³ = 145021391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145021391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72510699 + 72510700.

It is an arithmetic number, because the mean of its divisors is an integer number (72510700).

Almost surely, 2^145021399 is an apocalyptic number.

145021399 is a deficient number, since it is larger than the sum of its proper divisors (1).

145021399 is an equidigital number, since it uses as much as digits as its factorization.

145021399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 145021399 is about 12042.4830911237. The cubic root of 145021399 is about 525.3846300072.

The spelling of 145021399 in words is "one hundred forty-five million, twenty-one thousand, three hundred ninety-nine".