1261654741 has 2 divisors, whose sum is σ = 1261654742. Its totient is φ = 1261654740.

The previous prime is 1261654733. The next prime is 1261654753. The reversal of 1261654741 is 1474561621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990360900 + 271293841 = 31470^2 + 16471^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261654741 - 2³ = 1261654733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1261654741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261654721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630827370 + 630827371.

It is an arithmetic number, because the mean of its divisors is an integer number (630827371).

Almost surely, 2^1261654741 is an apocalyptic number.

It is an amenable number.

1261654741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261654741 is an equidigital number, since it uses as much as digits as its factorization.

1261654741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 1261654741 is about 35519.7795742034. The cubic root of 1261654741 is about 1080.5549105937.

The spelling of 1261654741 in words is "one billion, two hundred sixty-one million, six hundred fifty-four thousand, seven hundred forty-one".