1231351761 has 8 divisors (see below), whose sum is σ = 1642228704. Its totient is φ = 820688000.

The previous prime is 1231351727. The next prime is 1231351763. The reversal of 1231351761 is 1671531321.

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 1231351761 - 2¹⁴ = 1231335377 is a prime.

It is a super-2 number, since 2×1231351761² = 3032454318635602242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231351763) 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, 39291 + ... + 63296.

It is an arithmetic number, because the mean of its divisors is an integer number (205278588).

Almost surely, 2^1231351761 is an apocalyptic number.

It is an amenable number.

1231351761 is a deficient number, since it is larger than the sum of its proper divisors (410876943).

1231351761 is a wasteful number, since it uses less digits than its factorization.

1231351761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106591.

The product of its digits is 3780, while the sum is 30.

The square root of 1231351761 is about 35090.6221232967. The cubic root of 1231351761 is about 1071.8336280314.

The spelling of 1231351761 in words is "one billion, two hundred thirty-one million, three hundred fifty-one thousand, seven hundred sixty-one".