1261256270 has 8 divisors (see below), whose sum is σ = 2270261304. Its totient is φ = 504502504.

The previous prime is 1261256239. The next prime is 1261256273. The reversal of 1261256270 is 726521621.

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

It is a super-2 number, since 2×1261256270² = 3181534757228625800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261256273) 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, 63062804 + ... + 63062823.

It is an arithmetic number, because the mean of its divisors is an integer number (283782663).

Almost surely, 2^1261256270 is an apocalyptic number.

1261256270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261256270 is a deficient number, since it is larger than the sum of its proper divisors (1009005034).

1261256270 is a wasteful number, since it uses less digits than its factorization.

1261256270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126125634.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1261256270 is about 35514.1699888932. The cubic root of 1261256270 is about 1080.4411406589.

Adding to 1261256270 its reverse (726521621), we get a palindrome (1987777891).

The spelling of 1261256270 in words is "one billion, two hundred sixty-one million, two hundred fifty-six thousand, two hundred seventy".