218148907 has 2 divisors, whose sum is σ = 218148908. Its totient is φ = 218148906.

The previous prime is 218148883. The next prime is 218148967. The reversal of 218148907 is 709841812.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218148907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218148907.

It is not a weakly prime, because it can be changed into another prime (218148967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109074453 + 109074454.

It is an arithmetic number, because the mean of its divisors is an integer number (109074454).

Almost surely, 2^218148907 is an apocalyptic number.

218148907 is a deficient number, since it is larger than the sum of its proper divisors (1).

218148907 is an equidigital number, since it uses as much as digits as its factorization.

218148907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 218148907 is about 14769.8648267342. The cubic root of 218148907 is about 601.9831665657.

The spelling of 218148907 in words is "two hundred eighteen million, one hundred forty-eight thousand, nine hundred seven".