145447919 has 2 divisors, whose sum is σ = 145447920. Its totient is φ = 145447918.

The previous prime is 145447909. The next prime is 145447949. The reversal of 145447919 is 919744541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145447919 - 2⁸ = 145447663 is a prime.

It is a super-2 number, since 2×145447919² = 42310194282861122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 145447919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145447909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72723959 + 72723960.

It is an arithmetic number, because the mean of its divisors is an integer number (72723960).

Almost surely, 2^145447919 is an apocalyptic number.

145447919 is a deficient number, since it is larger than the sum of its proper divisors (1).

145447919 is an equidigital number, since it uses as much as digits as its factorization.

145447919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 145447919 is about 12060.1790616889. The cubic root of 145447919 is about 525.8991925154.

The spelling of 145447919 in words is "one hundred forty-five million, four hundred forty-seven thousand, nine hundred nineteen".