1240551461 has 4 divisors (see below), whose sum is σ = 1243242924. Its totient is φ = 1237860000.

The previous prime is 1240551451. The next prime is 1240551469. The reversal of 1240551461 is 1641550421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 577488961 + 663062500 = 24031^2 + 25750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240551461 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 (1240551469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345040 + ... + 1345961.

It is an arithmetic number, because the mean of its divisors is an integer number (310810731).

Almost surely, 2^1240551461 is an apocalyptic number.

It is an amenable number.

1240551461 is a deficient number, since it is larger than the sum of its proper divisors (2691463).

1240551461 is an equidigital number, since it uses as much as digits as its factorization.

1240551461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691462.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1240551461 is about 35221.4630729616. The cubic root of 1240551461 is about 1074.4963094810.

The spelling of 1240551461 in words is "one billion, two hundred forty million, five hundred fifty-one thousand, four hundred sixty-one".