261028597 has 2 divisors, whose sum is σ = 261028598. Its totient is φ = 261028596.

The previous prime is 261028571. The next prime is 261028613. The reversal of 261028597 is 795820162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258855921 + 2172676 = 16089^2 + 1474^2 .

It is a cyclic number.

It is not a de Polignac number, because 261028597 - 2¹⁵ = 260995829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261020597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130514298 + 130514299.

It is an arithmetic number, because the mean of its divisors is an integer number (130514299).

Almost surely, 2^261028597 is an apocalyptic number.

It is an amenable number.

261028597 is a deficient number, since it is larger than the sum of its proper divisors (1).

261028597 is an equidigital number, since it uses as much as digits as its factorization.

261028597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 261028597 is about 16156.3794520926. The cubic root of 261028597 is about 639.0909922400.

The spelling of 261028597 in words is "two hundred sixty-one million, twenty-eight thousand, five hundred ninety-seven".