152178121 has 2 divisors, whose sum is σ = 152178122. Its totient is φ = 152178120.

The previous prime is 152178119. The next prime is 152178137. The reversal of 152178121 is 121871251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152176896 + 1225 = 12336^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 152178121 - 2¹ = 152178119 is a prime.

It is a super-2 number, since 2×152178121² = 46316361022181282, which contains 22 as substring.

Together with 152178119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 152178121.

It is not a weakly prime, because it can be changed into another prime (152170121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76089060 + 76089061.

It is an arithmetic number, because the mean of its divisors is an integer number (76089061).

Almost surely, 2^152178121 is an apocalyptic number.

It is an amenable number.

152178121 is a deficient number, since it is larger than the sum of its proper divisors (1).

152178121 is an equidigital number, since it uses as much as digits as its factorization.

152178121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 28.

The square root of 152178121 is about 12336.0496513268. The cubic root of 152178121 is about 533.8887125653. Note that the first 3 decimals are identical.

The spelling of 152178121 in words is "one hundred fifty-two million, one hundred seventy-eight thousand, one hundred twenty-one".