261003157 has 2 divisors, whose sum is σ = 261003158. Its totient is φ = 261003156.

The previous prime is 261003109. The next prime is 261003187. The reversal of 261003157 is 751300162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150038001 + 110965156 = 12249^2 + 10534^2 .

It is a cyclic number.

It is not a de Polignac number, because 261003157 - 2¹¹ = 261001109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261003107) 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, 130501578 + 130501579.

It is an arithmetic number, because the mean of its divisors is an integer number (130501579).

Almost surely, 2^261003157 is an apocalyptic number.

It is an amenable number.

261003157 is a deficient number, since it is larger than the sum of its proper divisors (1).

261003157 is an equidigital number, since it uses as much as digits as its factorization.

261003157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 261003157 is about 16155.5921278052. The cubic root of 261003157 is about 639.0702295046.

The spelling of 261003157 in words is "two hundred sixty-one million, three thousand, one hundred fifty-seven".