261947093 has 2 divisors, whose sum is σ = 261947094. Its totient is φ = 261947092.

The previous prime is 261947071. The next prime is 261947123. The reversal of 261947093 is 390749162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137780644 + 124166449 = 11738^2 + 11143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261947093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261947093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261947003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130973546 + 130973547.

It is an arithmetic number, because the mean of its divisors is an integer number (130973547).

Almost surely, 2^261947093 is an apocalyptic number.

It is an amenable number.

261947093 is a deficient number, since it is larger than the sum of its proper divisors (1).

261947093 is an equidigital number, since it uses as much as digits as its factorization.

261947093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 261947093 is about 16184.7796710366. The cubic root of 261947093 is about 639.8397165347.

The spelling of 261947093 in words is "two hundred sixty-one million, nine hundred forty-seven thousand, ninety-three".