1242152391 has 8 divisors (see below), whose sum is σ = 1656429424. Its totient is φ = 827988480.

The previous prime is 1242152383. The next prime is 1242152449. The reversal of 1242152391 is 1932512421.

1242152391 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1242152391 - 2³ = 1242152383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242152321) 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, 1965 + ... + 49881.

It is an arithmetic number, because the mean of its divisors is an integer number (207053678).

Almost surely, 2^1242152391 is an apocalyptic number.

1242152391 is a deficient number, since it is larger than the sum of its proper divisors (414277033).

1242152391 is an equidigital number, since it uses as much as digits as its factorization.

1242152391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56561.

The product of its digits is 4320, while the sum is 30.

The square root of 1242152391 is about 35244.1823709956. The cubic root of 1242152391 is about 1074.9583228118.

The spelling of 1242152391 in words is "one billion, two hundred forty-two million, one hundred fifty-two thousand, three hundred ninety-one".