1261772367 has 8 divisors (see below), whose sum is σ = 1689710640. Its totient is φ = 837507840.

The previous prime is 1261772363. The next prime is 1261772371. The reversal of 1261772367 is 7632771621.

It is an interprime number because it is at equal distance from previous prime (1261772363) and next prime (1261772371).

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

It is not a de Polignac number, because 1261772367 - 2² = 1261772363 is a prime.

It is a super-2 number, since 2×1261772367² = 3184139012249565378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261772363) 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, 917634 + ... + 919007.

It is an arithmetic number, because the mean of its divisors is an integer number (211213830).

Almost surely, 2^1261772367 is an apocalyptic number.

1261772367 is a deficient number, since it is larger than the sum of its proper divisors (427938273).

1261772367 is a wasteful number, since it uses less digits than its factorization.

1261772367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836873.

The product of its digits is 148176, while the sum is 42.

The square root of 1261772367 is about 35521.4353172841. The cubic root of 1261772367 is about 1080.5884901455.

The spelling of 1261772367 in words is "one billion, two hundred sixty-one million, seven hundred seventy-two thousand, three hundred sixty-seven".