145821897 has 16 divisors (see below), whose sum is σ = 232650880. Its totient is φ = 89736336.

The previous prime is 145821877. The next prime is 145821899. The reversal of 145821897 is 798128541.

It is not a de Polignac number, because 145821897 - 2⁷ = 145821769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145821899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207373 + ... + 208074.

It is an arithmetic number, because the mean of its divisors is an integer number (14540680).

Almost surely, 2^145821897 is an apocalyptic number.

It is an amenable number.

145821897 is a deficient number, since it is larger than the sum of its proper divisors (86828983).

145821897 is a wasteful number, since it uses less digits than its factorization.

145821897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415469 (or 415463 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 145821897 is about 12075.6737700221. The cubic root of 145821897 is about 526.3495402081.

The spelling of 145821897 in words is "one hundred forty-five million, eight hundred twenty-one thousand, eight hundred ninety-seven".