261322057 has 2 divisors, whose sum is σ = 261322058. Its totient is φ = 261322056.

The previous prime is 261322037. The next prime is 261322093. The reversal of 261322057 is 750223162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256928841 + 4393216 = 16029^2 + 2096^2 .

It is a cyclic number.

It is not a de Polignac number, because 261322057 - 2¹¹ = 261320009 is a prime.

It is a super-2 number, since 2×261322057² = 136578434949422498, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261322037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130661028 + 130661029.

It is an arithmetic number, because the mean of its divisors is an integer number (130661029).

Almost surely, 2^261322057 is an apocalyptic number.

It is an amenable number.

261322057 is a deficient number, since it is larger than the sum of its proper divisors (1).

261322057 is an equidigital number, since it uses as much as digits as its factorization.

261322057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 261322057 is about 16165.4587624354. The cubic root of 261322057 is about 639.3304007511.

The spelling of 261322057 in words is "two hundred sixty-one million, three hundred twenty-two thousand, fifty-seven".