801257993 has 4 divisors (see below), whose sum is σ = 802062660. Its totient is φ = 800453328.

The previous prime is 801257981. The next prime is 801258037. The reversal of 801257993 is 399752108.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 713798089 + 87459904 = 26717^2 + 9352^2 .

It is a cyclic number.

It is not a de Polignac number, because 801257993 - 2⁶ = 801257929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (801257953) 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, 400838 + ... + 402831.

It is an arithmetic number, because the mean of its divisors is an integer number (200515665).

Almost surely, 2^801257993 is an apocalyptic number.

It is an amenable number.

801257993 is a deficient number, since it is larger than the sum of its proper divisors (804667).

801257993 is an equidigital number, since it uses as much as digits as its factorization.

801257993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804666.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 801257993 is about 28306.5008964372. The cubic root of 801257993 is about 928.8041024138.

The spelling of 801257993 in words is "eight hundred one million, two hundred fifty-seven thousand, nine hundred ninety-three".