261264077 has 2 divisors, whose sum is σ = 261264078. Its totient is φ = 261264076.

The previous prime is 261264053. The next prime is 261264097. The reversal of 261264077 is 770462162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198077476 + 63186601 = 14074^2 + 7949^2 .

It is a cyclic number.

It is not a de Polignac number, because 261264077 - 2¹⁸ = 261001933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261264097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130632038 + 130632039.

It is an arithmetic number, because the mean of its divisors is an integer number (130632039).

Almost surely, 2^261264077 is an apocalyptic number.

It is an amenable number.

261264077 is a deficient number, since it is larger than the sum of its proper divisors (1).

261264077 is an equidigital number, since it uses as much as digits as its factorization.

261264077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 261264077 is about 16163.6653330858. The cubic root of 261264077 is about 639.2831141209.

It can be divided in two parts, 26126 and 4077, that added together give a palindrome (30203).

The spelling of 261264077 in words is "two hundred sixty-one million, two hundred sixty-four thousand, seventy-seven".