261473593 has 2 divisors, whose sum is σ = 261473594. Its totient is φ = 261473592.

The previous prime is 261473579. The next prime is 261473603. The reversal of 261473593 is 395374162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157678249 + 103795344 = 12557^2 + 10188^2 .

It is a cyclic number.

It is not a de Polignac number, because 261473593 - 2⁹ = 261473081 is a prime.

It is not a weakly prime, because it can be changed into another prime (261473503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130736796 + 130736797.

It is an arithmetic number, because the mean of its divisors is an integer number (130736797).

Almost surely, 2^261473593 is an apocalyptic number.

It is an amenable number.

261473593 is a deficient number, since it is larger than the sum of its proper divisors (1).

261473593 is an equidigital number, since it uses as much as digits as its factorization.

261473593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 261473593 is about 16170.1451137583. The cubic root of 261473593 is about 639.4539556373.

The spelling of 261473593 in words is "two hundred sixty-one million, four hundred seventy-three thousand, five hundred ninety-three".