152638721 has 2 divisors, whose sum is σ = 152638722. Its totient is φ = 152638720.

The previous prime is 152638639. The next prime is 152638753. The reversal of 152638721 is 127836251.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89038096 + 63600625 = 9436^2 + 7975^2 .

It is a cyclic number.

It is not a de Polignac number, because 152638721 - 2¹⁸ = 152376577 is a prime.

It is not a weakly prime, because it can be changed into another prime (152638021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76319360 + 76319361.

It is an arithmetic number, because the mean of its divisors is an integer number (76319361).

Almost surely, 2^152638721 is an apocalyptic number.

It is an amenable number.

152638721 is a deficient number, since it is larger than the sum of its proper divisors (1).

152638721 is an equidigital number, since it uses as much as digits as its factorization.

152638721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 152638721 is about 12354.7044076336. The cubic root of 152638721 is about 534.4268132608.

The spelling of 152638721 in words is "one hundred fifty-two million, six hundred thirty-eight thousand, seven hundred twenty-one".