1261402117 has 4 divisors (see below), whose sum is σ = 1279168416. Its totient is φ = 1243635820.

The previous prime is 1261402061. The next prime is 1261402127. The reversal of 1261402117 is 7112041621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261402117 is a prime.

It is a super-2 number, since 2×1261402117² = 3182270601544163378, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261402091 and 1261402100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261402127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8883043 + ... + 8883184.

It is an arithmetic number, because the mean of its divisors is an integer number (319792104).

Almost surely, 2^1261402117 is an apocalyptic number.

It is an amenable number.

1261402117 is a deficient number, since it is larger than the sum of its proper divisors (17766299).

1261402117 is an equidigital number, since it uses as much as digits as its factorization.

1261402117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17766298.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1261402117 is about 35516.2232930248. The cubic root of 1261402117 is about 1080.4827851233.

Adding to 1261402117 its reverse (7112041621), we get a palindrome (8373443738).

The spelling of 1261402117 in words is "one billion, two hundred sixty-one million, four hundred two thousand, one hundred seventeen".