145187671 has 4 divisors (see below), whose sum is σ = 145214344. Its totient is φ = 145161000.

The previous prime is 145187657. The next prime is 145187681. The reversal of 145187671 is 176781541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176781541 = 109 ⋅1621849.

It is a 3-Lehmer number, since φ(145187671) divides (145187671-1)³.

It is a cyclic number.

It is not a de Polignac number, because 145187671 - 2¹⁵ = 145154903 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 (145187641) 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, 1905 + ... + 17146.

It is an arithmetic number, because the mean of its divisors is an integer number (36303586).

Almost surely, 2^145187671 is an apocalyptic number.

145187671 is the 7621-st heptagonal number.

145187671 is a deficient number, since it is larger than the sum of its proper divisors (26673).

145187671 is an equidigital number, since it uses as much as digits as its factorization.

145187671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26672.

The product of its digits is 47040, while the sum is 40.

The square root of 145187671 is about 12049.3846730860. The cubic root of 145187671 is about 525.5853438081.

The spelling of 145187671 in words is "one hundred forty-five million, one hundred eighty-seven thousand, six hundred seventy-one".