261190481 has 2 divisors, whose sum is σ = 261190482. Its totient is φ = 261190480.

The previous prime is 261190453. The next prime is 261190493. The reversal of 261190481 is 184091162.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178089025 + 83101456 = 13345^2 + 9116^2 .

It is a cyclic number.

It is not a de Polignac number, because 261190481 - 2¹⁴ = 261174097 is a prime.

It is a super-2 number, since 2×261190481² = 136440934730022722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261190441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130595240 + 130595241.

It is an arithmetic number, because the mean of its divisors is an integer number (130595241).

Almost surely, 2^261190481 is an apocalyptic number.

It is an amenable number.

261190481 is a deficient number, since it is larger than the sum of its proper divisors (1).

261190481 is an equidigital number, since it uses as much as digits as its factorization.

261190481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 261190481 is about 16161.3885851433. The cubic root of 261190481 is about 639.2230815043.

The spelling of 261190481 in words is "two hundred sixty-one million, one hundred ninety thousand, four hundred eighty-one".