1261004127 has 8 divisors (see below), whose sum is σ = 1686644016. Its totient is φ = 838016832.

The previous prime is 1261004099. The next prime is 1261004131. The reversal of 1261004127 is 7214001621.

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

It is not a de Polignac number, because 1261004127 - 2¹¹ = 1261002079 is a prime.

It is a super-2 number, since 2×1261004127² = 3180262816622064258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1261004097 and 1261004106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261004527) 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 7 ways as a sum of consecutive naturals, for example, 662038 + ... + 663939.

It is an arithmetic number, because the mean of its divisors is an integer number (210830502).

Almost surely, 2^1261004127 is an apocalyptic number.

1261004127 is a deficient number, since it is larger than the sum of its proper divisors (425639889).

1261004127 is a wasteful number, since it uses less digits than its factorization.

1261004127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326297.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 1261004127 is about 35510.6199185539. The cubic root of 1261004127 is about 1080.3691373627.

Adding to 1261004127 its reverse (7214001621), we get a palindrome (8475005748).

It can be divided in two parts, 1 and 261004127, that added together give a triangular number (261004128 = T₂₂₈₄₇).

The spelling of 1261004127 in words is "one billion, two hundred sixty-one million, four thousand, one hundred twenty-seven".