261358077 has 4 divisors (see below), whose sum is σ = 348477440. Its totient is φ = 174238716.

The previous prime is 261358037. The next prime is 261358081. The reversal of 261358077 is 770853162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261358077 - 2¹⁹ = 260833789 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 (261358037) 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, 43559677 + ... + 43559682.

It is an arithmetic number, because the mean of its divisors is an integer number (87119360).

Almost surely, 2^261358077 is an apocalyptic number.

It is an amenable number.

261358077 is a deficient number, since it is larger than the sum of its proper divisors (87119363).

261358077 is an equidigital number, since it uses as much as digits as its factorization.

261358077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87119362.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 261358077 is about 16166.5728279064. The cubic root of 261358077 is about 639.3597739867.

The spelling of 261358077 in words is "two hundred sixty-one million, three hundred fifty-eight thousand, seventy-seven".