151311221 has 2 divisors, whose sum is σ = 151311222. Its totient is φ = 151311220.

The previous prime is 151311191. The next prime is 151311233. The reversal of 151311221 is 122113151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79299025 + 72012196 = 8905^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 151311221 - 2¹⁴ = 151294837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 151311221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151341221) 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, 75655610 + 75655611.

It is an arithmetic number, because the mean of its divisors is an integer number (75655611).

Almost surely, 2^151311221 is an apocalyptic number.

It is an amenable number.

151311221 is a deficient number, since it is larger than the sum of its proper divisors (1).

151311221 is an equidigital number, since it uses as much as digits as its factorization.

151311221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60, while the sum is 17.

The square root of 151311221 is about 12300.8626120285. The cubic root of 151311221 is about 532.8729954462.

Adding to 151311221 its reverse (122113151), we get a palindrome (273424372).

The spelling of 151311221 in words is "one hundred fifty-one million, three hundred eleven thousand, two hundred twenty-one".