145481399 has 4 divisors (see below), whose sum is σ = 166264464. Its totient is φ = 124698336.

The previous prime is 145481389. The next prime is 145481437. The reversal of 145481399 is 993184541.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 145481399 - 2⁴ = 145481383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145481339) 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, 10391522 + ... + 10391535.

It is an arithmetic number, because the mean of its divisors is an integer number (41566116).

Almost surely, 2^145481399 is an apocalyptic number.

145481399 is a deficient number, since it is larger than the sum of its proper divisors (20783065).

145481399 is an equidigital number, since it uses as much as digits as its factorization.

145481399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20783064.

The product of its digits is 155520, while the sum is 44.

The square root of 145481399 is about 12061.5670209140. The cubic root of 145481399 is about 525.9395408735.

The spelling of 145481399 in words is "one hundred forty-five million, four hundred eighty-one thousand, three hundred ninety-nine".