1242253151 has 4 divisors (see below), whose sum is σ = 1242326304. Its totient is φ = 1242180000.

The previous prime is 1242253141. The next prime is 1242253153. The reversal of 1242253151 is 1513522421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1513522421 = 41 ⋅36915181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242253151 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1242253151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242253153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3626 + ... + 49976.

It is an arithmetic number, because the mean of its divisors is an integer number (310581576).

Almost surely, 2^1242253151 is an apocalyptic number.

1242253151 is a deficient number, since it is larger than the sum of its proper divisors (73153).

1242253151 is an equidigital number, since it uses as much as digits as its factorization.

1242253151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73152.

The product of its digits is 2400, while the sum is 26.

The square root of 1242253151 is about 35245.6117977827. The cubic root of 1242253151 is about 1074.9873879177.

Adding to 1242253151 its reverse (1513522421), we get a palindrome (2755775572).

The spelling of 1242253151 in words is "one billion, two hundred forty-two million, two hundred fifty-three thousand, one hundred fifty-one".