151221343181 has 2 divisors, whose sum is σ = 151221343182. Its totient is φ = 151221343180.

The previous prime is 151221343151. The next prime is 151221343187. The reversal of 151221343181 is 181343122151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127205642281 + 24015700900 = 356659^2 + 154970^2 .

It is a cyclic number.

It is not a de Polignac number, because 151221343181 - 2¹⁴ = 151221326797 is a prime.

It is a super-2 number, since 2×151221343181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (151221343187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75610671590 + 75610671591.

It is an arithmetic number, because the mean of its divisors is an integer number (75610671591).

Almost surely, 2^151221343181 is an apocalyptic number.

It is an amenable number.

151221343181 is a deficient number, since it is larger than the sum of its proper divisors (1).

151221343181 is an equidigital number, since it uses as much as digits as its factorization.

151221343181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 32.

The spelling of 151221343181 in words is "one hundred fifty-one billion, two hundred twenty-one million, three hundred forty-three thousand, one hundred eighty-one".