1242354551 has 4 divisors (see below), whose sum is σ = 1242498504. Its totient is φ = 1242210600.

The previous prime is 1242354527. The next prime is 1242354557. The reversal of 1242354551 is 1554532421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1554532421 = 13 ⋅119579417.

It is a cyclic number.

It is not a de Polignac number, because 1242354551 - 2³⁰ = 168612727 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 (1242354557) 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, 58145 + ... + 76586.

It is an arithmetic number, because the mean of its divisors is an integer number (310624626).

Almost surely, 2^1242354551 is an apocalyptic number.

1242354551 is a deficient number, since it is larger than the sum of its proper divisors (143953).

1242354551 is an equidigital number, since it uses as much as digits as its factorization.

1242354551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143952.

The product of its digits is 24000, while the sum is 32.

The square root of 1242354551 is about 35247.0502453751. The cubic root of 1242354551 is about 1075.0166360505.

Adding to 1242354551 its reverse (1554532421), we get a palindrome (2796886972).

The spelling of 1242354551 in words is "one billion, two hundred forty-two million, three hundred fifty-four thousand, five hundred fifty-one".