1240542151 has 2 divisors, whose sum is σ = 1240542152. Its totient is φ = 1240542150.

The previous prime is 1240542143. The next prime is 1240542157. The reversal of 1240542151 is 1512450421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240542151 - 2³ = 1240542143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240542157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620271075 + 620271076.

It is an arithmetic number, because the mean of its divisors is an integer number (620271076).

Almost surely, 2^1240542151 is an apocalyptic number.

1240542151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240542151 is an equidigital number, since it uses as much as digits as its factorization.

1240542151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1240542151 is about 35221.3309089818. The cubic root of 1240542151 is about 1074.4936215405.

Adding to 1240542151 its reverse (1512450421), we get a palindrome (2752992572).

The spelling of 1240542151 in words is "one billion, two hundred forty million, five hundred forty-two thousand, one hundred fifty-one".