145721903 has 2 divisors, whose sum is σ = 145721904. Its totient is φ = 145721902.

The previous prime is 145721893. The next prime is 145721923. The reversal of 145721903 is 309127541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145721903 - 2⁸ = 145721647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145721903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145721923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72860951 + 72860952.

It is an arithmetic number, because the mean of its divisors is an integer number (72860952).

Almost surely, 2^145721903 is an apocalyptic number.

145721903 is a deficient number, since it is larger than the sum of its proper divisors (1).

145721903 is an equidigital number, since it uses as much as digits as its factorization.

145721903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 145721903 is about 12071.5327527203. The cubic root of 145721903 is about 526.2292020149.

The spelling of 145721903 in words is "one hundred forty-five million, seven hundred twenty-one thousand, nine hundred three".