151188721 has 2 divisors, whose sum is σ = 151188722. Its totient is φ = 151188720.

The previous prime is 151188691. The next prime is 151188743. The reversal of 151188721 is 127881151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75690000 + 75498721 = 8700^2 + 8689^2 .

It is an emirp because it is prime and its reverse (127881151) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-151188721 is a prime.

It is not a weakly prime, because it can be changed into another prime (151188761) 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 as a sum of consecutive naturals, namely, 75594360 + 75594361.

It is an arithmetic number, because the mean of its divisors is an integer number (75594361).

Almost surely, 2^151188721 is an apocalyptic number.

It is an amenable number.

151188721 is a deficient number, since it is larger than the sum of its proper divisors (1).

151188721 is an equidigital number, since it uses as much as digits as its factorization.

151188721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 34.

The square root of 151188721 is about 12295.8822782263. The cubic root of 151188721 is about 532.7291537992.

The spelling of 151188721 in words is "one hundred fifty-one million, one hundred eighty-eight thousand, seven hundred twenty-one".