145491019 has 4 divisors (see below), whose sum is σ = 145536496. Its totient is φ = 145445544.

The previous prime is 145490959. The next prime is 145491043. The reversal of 145491019 is 910194541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 910194541 = 257 ⋅3541613.

It is a cyclic number.

It is not a de Polignac number, because 145491019 - 2¹¹ = 145488971 is a prime.

It is a super-2 number, since 2×145491019² = 42335273219316722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145491079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17544 + ... + 24469.

It is an arithmetic number, because the mean of its divisors is an integer number (36384124).

Almost surely, 2^145491019 is an apocalyptic number.

145491019 is a deficient number, since it is larger than the sum of its proper divisors (45477).

145491019 is an equidigital number, since it uses as much as digits as its factorization.

145491019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45476.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 145491019 is about 12061.9658016428. The cubic root of 145491019 is about 525.9511332532.

The spelling of 145491019 in words is "one hundred forty-five million, four hundred ninety-one thousand, nineteen".