251972610841 has 4 divisors (see below), whose sum is σ = 287968698112. Its totient is φ = 215976523572.

The previous prime is 251972610829. The next prime is 251972610853. The reversal of 251972610841 is 148016279152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (251972610829) and next prime (251972610853).

It is a cyclic number.

It is not a de Polignac number, because 251972610841 - 2²⁵ = 251939056409 is a prime.

It is a super-2 number, since 2×251972610841² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 251972610791 and 251972610800.

It is not an unprimeable number, because it can be changed into a prime (251972610941) 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, 17998043625 + ... + 17998043638.

It is an arithmetic number, because the mean of its divisors is an integer number (71992174528).

Almost surely, 2^251972610841 is an apocalyptic number.

It is an amenable number.

251972610841 is a deficient number, since it is larger than the sum of its proper divisors (35996087271).

251972610841 is an equidigital number, since it uses as much as digits as its factorization.

251972610841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35996087270.

The product of its (nonzero) digits is 241920, while the sum is 46.

Adding to 251972610841 its reverse (148016279152), we get a palindrome (399988889993).

The spelling of 251972610841 in words is "two hundred fifty-one billion, nine hundred seventy-two million, six hundred ten thousand, eight hundred forty-one".