1242151253 has 4 divisors (see below), whose sum is σ = 1419601440. Its totient is φ = 1064701068.

The previous prime is 1242151243. The next prime is 1242151279. The reversal of 1242151253 is 3521512421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1242151253 - 2²⁴ = 1225374037 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 (1242151243) 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, 88725083 + ... + 88725096.

It is an arithmetic number, because the mean of its divisors is an integer number (354900360).

Almost surely, 2^1242151253 is an apocalyptic number.

It is an amenable number.

1242151253 is a deficient number, since it is larger than the sum of its proper divisors (177450187).

1242151253 is an equidigital number, since it uses as much as digits as its factorization.

1242151253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177450186.

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

The square root of 1242151253 is about 35244.1662264835. The cubic root of 1242151253 is about 1074.9579945368.

Adding to 1242151253 its reverse (3521512421), we get a palindrome (4763663674).

The spelling of 1242151253 in words is "one billion, two hundred forty-two million, one hundred fifty-one thousand, two hundred fifty-three".