1261258269 has 8 divisors (see below), whose sum is σ = 1687621152. Its totient is φ = 837867120.

The previous prime is 1261258267. The next prime is 1261258309. The reversal of 1261258269 is 9628521621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1261258269 - 2¹ = 1261258267 is a prime.

It is a super-2 number, since 2×1261258269² = 3181544842241752722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1261258269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261258261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 741942 + ... + 743639.

It is an arithmetic number, because the mean of its divisors is an integer number (210952644).

Almost surely, 2^1261258269 is an apocalyptic number.

It is an amenable number.

1261258269 is a deficient number, since it is larger than the sum of its proper divisors (426362883).

1261258269 is a wasteful number, since it uses less digits than its factorization.

1261258269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485867.

The product of its digits is 103680, while the sum is 42.

The square root of 1261258269 is about 35514.1981325779. The cubic root of 1261258269 is about 1080.4417114656.

The spelling of 1261258269 in words is "one billion, two hundred sixty-one million, two hundred fifty-eight thousand, two hundred sixty-nine".