261020359 has 4 divisors (see below), whose sum is σ = 261106704. Its totient is φ = 260934016.

The previous prime is 261020351. The next prime is 261020371. The reversal of 261020359 is 953020162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261020359 - 2³ = 261020351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261020351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38467 + ... + 44740.

It is an arithmetic number, because the mean of its divisors is an integer number (65276676).

Almost surely, 2^261020359 is an apocalyptic number.

261020359 is a deficient number, since it is larger than the sum of its proper divisors (86345).

261020359 is an equidigital number, since it uses as much as digits as its factorization.

261020359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86344.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 261020359 is about 16156.1245043482. The cubic root of 261020359 is about 639.0842689830.

The spelling of 261020359 in words is "two hundred sixty-one million, twenty thousand, three hundred fifty-nine".