261025057 has 2 divisors, whose sum is σ = 261025058. Its totient is φ = 261025056.

The previous prime is 261025049. The next prime is 261025073. The reversal of 261025057 is 750520162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170851041 + 90174016 = 13071^2 + 9496^2 .

It is a cyclic number.

It is not a de Polignac number, because 261025057 - 2³ = 261025049 is a prime.

It is not a weakly prime, because it can be changed into another prime (261025087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130512528 + 130512529.

It is an arithmetic number, because the mean of its divisors is an integer number (130512529).

Almost surely, 2^261025057 is an apocalyptic number.

It is an amenable number.

261025057 is a deficient number, since it is larger than the sum of its proper divisors (1).

261025057 is an equidigital number, since it uses as much as digits as its factorization.

261025057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 261025057 is about 16156.2698974732. The cubic root of 261025057 is about 639.0881031666.

The spelling of 261025057 in words is "two hundred sixty-one million, twenty-five thousand, fifty-seven".