1240345551 has 8 divisors (see below), whose sum is σ = 1751076144. Its totient is φ = 778256000.

The previous prime is 1240345537. The next prime is 1240345577. The reversal of 1240345551 is 1555430421.

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 1240345551 - 2⁷ = 1240345423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1245345551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12160200 + ... + 12160301.

It is an arithmetic number, because the mean of its divisors is an integer number (218884518).

Almost surely, 2^1240345551 is an apocalyptic number.

1240345551 is a deficient number, since it is larger than the sum of its proper divisors (510730593).

1240345551 is a wasteful number, since it uses less digits than its factorization.

1240345551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24320521.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1240345551 is about 35218.5398760369. The cubic root of 1240345551 is about 1074.4368569487.

Adding to 1240345551 its reverse (1555430421), we get a palindrome (2795775972).

The spelling of 1240345551 in words is "one billion, two hundred forty million, three hundred forty-five thousand, five hundred fifty-one".