151516921 has 2 divisors, whose sum is σ = 151516922. Its totient is φ = 151516920.

The previous prime is 151516919. The next prime is 151516943. The reversal of 151516921 is 129615151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 4161600 = 12139^2 + 2040^2 .

It is an emirp because it is prime and its reverse (129615151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 151516921 - 2¹ = 151516919 is a prime.

Together with 151516919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (151516991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75758460 + 75758461.

It is an arithmetic number, because the mean of its divisors is an integer number (75758461).

Almost surely, 2^151516921 is an apocalyptic number.

It is an amenable number.

151516921 is a deficient number, since it is larger than the sum of its proper divisors (1).

151516921 is an equidigital number, since it uses as much as digits as its factorization.

151516921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2700, while the sum is 31.

The square root of 151516921 is about 12309.2209745377. The cubic root of 151516921 is about 533.1143574577.

The spelling of 151516921 in words is "one hundred fifty-one million, five hundred sixteen thousand, nine hundred twenty-one".