145501999 has 2 divisors, whose sum is σ = 145502000. Its totient is φ = 145501998.

The previous prime is 145501987. The next prime is 145502039. The reversal of 145501999 is 999105541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145501999 - 2¹⁵ = 145469231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145501799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72750999 + 72751000.

It is an arithmetic number, because the mean of its divisors is an integer number (72751000).

Almost surely, 2^145501999 is an apocalyptic number.

145501999 is a deficient number, since it is larger than the sum of its proper divisors (1).

145501999 is an equidigital number, since it uses as much as digits as its factorization.

145501999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 43.

The square root of 145501999 is about 12062.4209427461. The cubic root of 145501999 is about 525.9643638481.

The spelling of 145501999 in words is "one hundred forty-five million, five hundred one thousand, nine hundred ninety-nine".