813425251 has 4 divisors (see below), whose sum is σ = 813570400. Its totient is φ = 813280104.

The previous prime is 813425237. The next prime is 813425293. The reversal of 813425251 is 152524318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152524318 = 2 ⋅76262159.

It is a cyclic number.

It is not a de Polignac number, because 813425251 - 2¹¹ = 813423203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813425351) 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, 63816 + ... + 75493.

It is an arithmetic number, because the mean of its divisors is an integer number (203392600).

Almost surely, 2^813425251 is an apocalyptic number.

813425251 is a deficient number, since it is larger than the sum of its proper divisors (145149).

813425251 is a wasteful number, since it uses less digits than its factorization.

813425251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145148.

The product of its digits is 9600, while the sum is 31.

The square root of 813425251 is about 28520.6109857415. The cubic root of 813425251 is about 933.4818609572.

Adding to 813425251 its reverse (152524318), we get a palindrome (965949569).

The spelling of 813425251 in words is "eight hundred thirteen million, four hundred twenty-five thousand, two hundred fifty-one".