261961433 has 2 divisors, whose sum is σ = 261961434. Its totient is φ = 261961432.

The previous prime is 261961429. The next prime is 261961451. The reversal of 261961433 is 334169162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156550144 + 105411289 = 12512^2 + 10267^2 .

It is a cyclic number.

It is not a de Polignac number, because 261961433 - 2² = 261961429 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 261961393 and 261961402.

It is not a weakly prime, because it can be changed into another prime (261961933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130980716 + 130980717.

It is an arithmetic number, because the mean of its divisors is an integer number (130980717).

Almost surely, 2^261961433 is an apocalyptic number.

It is an amenable number.

261961433 is a deficient number, since it is larger than the sum of its proper divisors (1).

261961433 is an equidigital number, since it uses as much as digits as its factorization.

261961433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 35.

The square root of 261961433 is about 16185.2226737849. Note that the first 3 decimals coincide. The cubic root of 261961433 is about 639.8513920910.

The spelling of 261961433 in words is "two hundred sixty-one million, nine hundred sixty-one thousand, four hundred thirty-three".