251326541 has 2 divisors, whose sum is σ = 251326542. Its totient is φ = 251326540.

The previous prime is 251326511. The next prime is 251326553. The reversal of 251326541 is 145623152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166152100 + 85174441 = 12890^2 + 9229^2 .

It is a cyclic number.

It is not a de Polignac number, because 251326541 - 2¹⁰ = 251325517 is a prime.

It is a super-2 number, since 2×251326541² = 126330060422049362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251326501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125663270 + 125663271.

It is an arithmetic number, because the mean of its divisors is an integer number (125663271).

Almost surely, 2^251326541 is an apocalyptic number.

It is an amenable number.

251326541 is a deficient number, since it is larger than the sum of its proper divisors (1).

251326541 is an equidigital number, since it uses as much as digits as its factorization.

251326541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 29.

The square root of 251326541 is about 15853.2817107374. The cubic root of 251326541 is about 631.0727846033.

Adding to 251326541 its reverse (145623152), we get a palindrome (396949693).

The spelling of 251326541 in words is "two hundred fifty-one million, three hundred twenty-six thousand, five hundred forty-one".