261338077 has 16 divisors (see below), whose sum is σ = 350888832. Its totient is φ = 187974720.

The previous prime is 261338039. The next prime is 261338101. The reversal of 261338077 is 770833162.

It is a cyclic number.

It is not a de Polignac number, because 261338077 - 2⁷ = 261337949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261338677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129538 + ... + 131539.

It is an arithmetic number, because the mean of its divisors is an integer number (21930552).

Almost surely, 2^261338077 is an apocalyptic number.

It is an amenable number.

261338077 is a deficient number, since it is larger than the sum of its proper divisors (89550755).

261338077 is a wasteful number, since it uses less digits than its factorization.

261338077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261108.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 261338077 is about 16165.9542557809. The cubic root of 261338077 is about 639.3434649165.

The spelling of 261338077 in words is "two hundred sixty-one million, three hundred thirty-eight thousand, seventy-seven".