145817257 has 16 divisors (see below), whose sum is σ = 153679680. Its totient is φ = 138220992.

The previous prime is 145817239. The next prime is 145817293. The reversal of 145817257 is 752718541.

It is a cyclic number.

It is not a de Polignac number, because 145817257 - 2⁷ = 145817129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145817207) 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, 248118 + ... + 248704.

It is an arithmetic number, because the mean of its divisors is an integer number (9604980).

Almost surely, 2^145817257 is an apocalyptic number.

It is an amenable number.

145817257 is a deficient number, since it is larger than the sum of its proper divisors (7862423).

145817257 is a wasteful number, since it uses less digits than its factorization.

145817257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its digits is 78400, while the sum is 40.

The square root of 145817257 is about 12075.4816467088. The cubic root of 145817257 is about 526.3439573982.

The spelling of 145817257 in words is "one hundred forty-five million, eight hundred seventeen thousand, two hundred fifty-seven".