145451409 has 4 divisors (see below), whose sum is σ = 193935216. Its totient is φ = 96967604.

The previous prime is 145451399. The next prime is 145451437. The reversal of 145451409 is 904154541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145451409 - 2⁵ = 145451377 is a prime.

It is a super-2 number, since 2×145451409² = 42312224760170562, 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 145451409.

It is not an unprimeable number, because it can be changed into a prime (145451459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24241899 + ... + 24241904.

It is an arithmetic number, because the mean of its divisors is an integer number (48483804).

Almost surely, 2^145451409 is an apocalyptic number.

It is an amenable number.

145451409 is a deficient number, since it is larger than the sum of its proper divisors (48483807).

145451409 is an equidigital number, since it uses as much as digits as its factorization.

145451409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48483806.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 145451409 is about 12060.3237518733. The cubic root of 145451409 is about 525.9033987713.

The spelling of 145451409 in words is "one hundred forty-five million, four hundred fifty-one thousand, four hundred nine".