261622093 has 2 divisors, whose sum is σ = 261622094. Its totient is φ = 261622092.

The previous prime is 261622063. The next prime is 261622099. The reversal of 261622093 is 390226162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235376964 + 26245129 = 15342^2 + 5123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261622093 is a prime.

It is a super-2 number, since 2×261622093² = 136892239091401298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261622099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130811046 + 130811047.

It is an arithmetic number, because the mean of its divisors is an integer number (130811047).

Almost surely, 2^261622093 is an apocalyptic number.

It is an amenable number.

261622093 is a deficient number, since it is larger than the sum of its proper divisors (1).

261622093 is an equidigital number, since it uses as much as digits as its factorization.

261622093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 261622093 is about 16174.7362575097. The cubic root of 261622093 is about 639.5749888172.

The spelling of 261622093 in words is "two hundred sixty-one million, six hundred twenty-two thousand, ninety-three".