1231648737 has 16 divisors (see below), whose sum is σ = 1793003520. Its totient is φ = 745822800.

The previous prime is 1231648729. The next prime is 1231648753. The reversal of 1231648737 is 7378461321.

It is not a de Polignac number, because 1231648737 - 2³ = 1231648729 is a prime.

It is a super-2 number, since 2×1231648737² = 3033917222707390338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231648037) 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 15 ways as a sum of consecutive naturals, for example, 25464 + ... + 55782.

It is an arithmetic number, because the mean of its divisors is an integer number (112062720).

Almost surely, 2^1231648737 is an apocalyptic number.

It is an amenable number.

1231648737 is a deficient number, since it is larger than the sum of its proper divisors (561354783).

1231648737 is a wasteful number, since it uses less digits than its factorization.

1231648737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31564.

The product of its digits is 169344, while the sum is 42.

The square root of 1231648737 is about 35094.8534261079. The cubic root of 1231648737 is about 1071.9197889718.

The spelling of 1231648737 in words is "one billion, two hundred thirty-one million, six hundred forty-eight thousand, seven hundred thirty-seven".