1218507157 has 16 divisors (see below), whose sum is σ = 1426134400. Its totient is φ = 1040661216.

The previous prime is 1218507151. The next prime is 1218507163. The reversal of 1218507157 is 7517058121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1218507151) and next prime (1218507163).

It is not a de Polignac number, because 1218507157 - 2³ = 1218507149 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 (1218507151) 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 15 ways as a sum of consecutive naturals, for example, 90793 + ... + 103345.

It is an arithmetic number, because the mean of its divisors is an integer number (89133400).

Almost surely, 2^1218507157 is an apocalyptic number.

It is an amenable number.

1218507157 is a deficient number, since it is larger than the sum of its proper divisors (207627243).

1218507157 is an equidigital number, since it uses as much as digits as its factorization.

1218507157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12857 (or 12843 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 37.

The square root of 1218507157 is about 34907.1218664616. The cubic root of 1218507157 is about 1068.0937197117.

The spelling of 1218507157 in words is "one billion, two hundred eighteen million, five hundred seven thousand, one hundred fifty-seven".