1242313531 has 8 divisors (see below), whose sum is σ = 1275028560. Its totient is φ = 1210015488.

The previous prime is 1242313529. The next prime is 1242313577. The reversal of 1242313531 is 1353132421.

It is a happy number.

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 1242313531 - 2¹ = 1242313529 is a prime.

It is a super-2 number, since 2×1242313531² = 3086685818611375922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242313496 and 1242313505.

It is not an unprimeable number, because it can be changed into a prime (1242313511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98206 + ... + 110131.

It is an arithmetic number, because the mean of its divisors is an integer number (159378570).

Almost surely, 2^1242313531 is an apocalyptic number.

1242313531 is a deficient number, since it is larger than the sum of its proper divisors (32715029).

1242313531 is an equidigital number, since it uses as much as digits as its factorization.

1242313531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208493.

The product of its digits is 2160, while the sum is 25.

The square root of 1242313531 is about 35246.4683479069. The cubic root of 1242313531 is about 1075.0048043052.

Adding to 1242313531 its reverse (1353132421), we get a palindrome (2595445952).

The spelling of 1242313531 in words is "one billion, two hundred forty-two million, three hundred thirteen thousand, five hundred thirty-one".