261551527 has 2 divisors, whose sum is σ = 261551528. Its totient is φ = 261551526.

The previous prime is 261551513. The next prime is 261551533. The reversal of 261551527 is 725155162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261551527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261551492 and 261551501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261551567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130775763 + 130775764.

It is an arithmetic number, because the mean of its divisors is an integer number (130775764).

Almost surely, 2^261551527 is an apocalyptic number.

261551527 is a deficient number, since it is larger than the sum of its proper divisors (1).

261551527 is an equidigital number, since it uses as much as digits as its factorization.

261551527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 34.

The square root of 261551527 is about 16172.5547456177. The cubic root of 261551527 is about 639.5174805406.

The spelling of 261551527 in words is "two hundred sixty-one million, five hundred fifty-one thousand, five hundred twenty-seven".