1242031311 has 12 divisors (see below), whose sum is σ = 1888468920. Its totient is φ = 784440720.

The previous prime is 1242031291. The next prime is 1242031331. The reversal of 1242031311 is 1131302421.

It is an interprime number because it is at equal distance from previous prime (1242031291) and next prime (1242031331).

It is not a de Polignac number, because 1242031311 - 2⁶ = 1242031247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242031331) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3631500 + ... + 3631841.

It is an arithmetic number, because the mean of its divisors is an integer number (157372410).

Almost surely, 2^1242031311 is an apocalyptic number.

1242031311 is a deficient number, since it is larger than the sum of its proper divisors (646437609).

1242031311 is a wasteful number, since it uses less digits than its factorization.

1242031311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7263366 (or 7263363 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1242031311 is about 35242.4645988330. The cubic root of 1242031311 is about 1074.9233941445.

Adding to 1242031311 its reverse (1131302421), we get a palindrome (2373333732).

The spelling of 1242031311 in words is "one billion, two hundred forty-two million, thirty-one thousand, three hundred eleven".