151500721 has 2 divisors, whose sum is σ = 151500722. Its totient is φ = 151500720.

The previous prime is 151500703. The next prime is 151500779. The reversal of 151500721 is 127005151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145926400 + 5574321 = 12080^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 151500721 - 2¹⁹ = 150976433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 151500692 and 151500701.

It is not a weakly prime, because it can be changed into another prime (151500121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75750360 + 75750361.

It is an arithmetic number, because the mean of its divisors is an integer number (75750361).

Almost surely, 2^151500721 is an apocalyptic number.

It is an amenable number.

151500721 is a deficient number, since it is larger than the sum of its proper divisors (1).

151500721 is an equidigital number, since it uses as much as digits as its factorization.

151500721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 151500721 is about 12308.5629136792. The cubic root of 151500721 is about 533.0953568067.

Adding to 151500721 its reverse (127005151), we get a palindrome (278505872).

The spelling of 151500721 in words is "one hundred fifty-one million, five hundred thousand, seven hundred twenty-one".