1273922261 has 4 divisors (see below), whose sum is σ = 1275002124. Its totient is φ = 1272842400.

The previous prime is 1273922227. The next prime is 1273922269. The reversal of 1273922261 is 1622293721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 954192100 + 319730161 = 30890^2 + 17881^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273922261 - 2²⁶ = 1206813397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273922269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538160 + ... + 540521.

It is an arithmetic number, because the mean of its divisors is an integer number (318750531).

Almost surely, 2^1273922261 is an apocalyptic number.

It is an amenable number.

1273922261 is a deficient number, since it is larger than the sum of its proper divisors (1079863).

1273922261 is a wasteful number, since it uses less digits than its factorization.

1273922261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079862.

The product of its digits is 18144, while the sum is 35.

The square root of 1273922261 is about 35692.0475876630. The cubic root of 1273922261 is about 1084.0458276514.

The spelling of 1273922261 in words is "one billion, two hundred seventy-three million, nine hundred twenty-two thousand, two hundred sixty-one".