1261506047 has 8 divisors (see below), whose sum is σ = 1337935200. Its totient is φ = 1186875360.

The previous prime is 1261506041. The next prime is 1261506089. The reversal of 1261506047 is 7406051621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261506047 - 2⁴ = 1261506031 is a prime.

It is a super-3 number, since 3×1261506047³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261506041) 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, 448172 + ... + 450977.

It is an arithmetic number, because the mean of its divisors is an integer number (167241900).

Almost surely, 2^1261506047 is an apocalyptic number.

1261506047 is a deficient number, since it is larger than the sum of its proper divisors (76429153).

1261506047 is an equidigital number, since it uses as much as digits as its factorization.

1261506047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899233.

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

The square root of 1261506047 is about 35517.6863970614. The cubic root of 1261506047 is about 1080.5124588465.

Adding to 1261506047 its reverse (7406051621), we get a palindrome (8667557668).

The spelling of 1261506047 in words is "one billion, two hundred sixty-one million, five hundred six thousand, forty-seven".