261458 has 4 divisors (see below), whose sum is σ = 392190. Its totient is φ = 130728.

The previous prime is 261451. The next prime is 261463. The reversal of 261458 is 854162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 854162 = 2 ⋅427081.

It can be written as a sum of positive squares in only one way, i.e., 214369 + 47089 = 463^2 + 217^2 .

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (261451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65363 + ... + 65366.

2²⁶¹⁴⁵⁸ is an apocalyptic number.

261458 is a deficient number, since it is larger than the sum of its proper divisors (130732).

261458 is a wasteful number, since it uses less digits than its factorization.

261458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130731.

The product of its digits is 1920, while the sum is 26.

The square root of 261458 is about 511.3296392739. The cubic root of 261458 is about 63.9441244088.

Subtracting 261458 from its reverse (854162), we obtain a cube (592704 = 84³).

The spelling of 261458 in words is "two hundred sixty-one thousand, four hundred fifty-eight".