1231424639 has 16 divisors (see below), whose sum is σ = 1292967936. Its totient is φ = 1171648800.

The previous prime is 1231424611. The next prime is 1231424647. The reversal of 1231424639 is 9364241321.

It is a cyclic number.

It is not a de Polignac number, because 1231424639 - 2¹² = 1231420543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231424599 and 1231424608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231424609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331784 + ... + 335474.

It is an arithmetic number, because the mean of its divisors is an integer number (80810496).

Almost surely, 2^1231424639 is an apocalyptic number.

1231424639 is a deficient number, since it is larger than the sum of its proper divisors (61543297).

1231424639 is a wasteful number, since it uses less digits than its factorization.

1231424639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926.

The product of its digits is 31104, while the sum is 35.

The square root of 1231424639 is about 35091.6605335228. The cubic root of 1231424639 is about 1071.8547732347.

The spelling of 1231424639 in words is "one billion, two hundred thirty-one million, four hundred twenty-four thousand, six hundred thirty-nine".