145371809 has 8 divisors (see below), whose sum is σ = 164056320. Its totient is φ = 127598800.

The previous prime is 145371791. The next prime is 145371817. The reversal of 145371809 is 908173541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145371809 is a prime.

It is a super-2 number, since 2×145371809² = 42265925703864962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145371859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227537 + ... + 228174.

It is an arithmetic number, because the mean of its divisors is an integer number (20507040).

Almost surely, 2^145371809 is an apocalyptic number.

It is an amenable number.

145371809 is a deficient number, since it is larger than the sum of its proper divisors (18684511).

145371809 is a wasteful number, since it uses less digits than its factorization.

145371809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455751.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 145371809 is about 12057.0232230016. The cubic root of 145371809 is about 525.8074456517.

The spelling of 145371809 in words is "one hundred forty-five million, three hundred seventy-one thousand, eight hundred nine".