261370 has 16 divisors (see below), whose sum is σ = 479520. Its totient is φ = 102544.

The previous prime is 261353. The next prime is 261379. The reversal of 261370 is 73162.

It is not an unprimeable number, because it can be changed into a prime (261379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 811.

It is an arithmetic number, because the mean of its divisors is an integer number (29970).

2²⁶¹³⁷⁰ is an apocalyptic number.

261370 is a deficient number, since it is larger than the sum of its proper divisors (218150).

261370 is a wasteful number, since it uses less digits than its factorization.

261370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 261370 is about 511.2435818668. The cubic root of 261370 is about 63.9369496243.

The spelling of 261370 in words is "two hundred sixty-one thousand, three hundred seventy".