163256501 has 4 divisors (see below), whose sum is σ = 164873004. Its totient is φ = 161640000.

The previous prime is 163256479. The next prime is 163256503. The reversal of 163256501 is 105652361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 105652361 = 2767 ⋅38183.

It can be written as a sum of positive squares in 2 ways, for example, as 120340900 + 42915601 = 10970^2 + 6551^2 .

It is a cyclic number.

It is not a de Polignac number, because 163256501 - 2⁶ = 163256437 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163256503) 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, 808100 + ... + 808301.

It is an arithmetic number, because the mean of its divisors is an integer number (41218251).

Almost surely, 2^163256501 is an apocalyptic number.

It is an amenable number.

163256501 is a deficient number, since it is larger than the sum of its proper divisors (1616503).

163256501 is a wasteful number, since it uses less digits than its factorization.

163256501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616502.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 163256501 is about 12777.1867404370. The cubic root of 163256501 is about 546.5419409003.

The spelling of 163256501 in words is "one hundred sixty-three million, two hundred fifty-six thousand, five hundred one".