152638021 has 2 divisors, whose sum is σ = 152638022. Its totient is φ = 152638020.

The previous prime is 152638009. The next prime is 152638063. The reversal of 152638021 is 120836251.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125753796 + 26884225 = 11214^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 152638021 - 2²¹ = 150540869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (152638091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76319010 + 76319011.

It is an arithmetic number, because the mean of its divisors is an integer number (76319011).

Almost surely, 2^152638021 is an apocalyptic number.

It is an amenable number.

152638021 is a deficient number, since it is larger than the sum of its proper divisors (1).

152638021 is an equidigital number, since it uses as much as digits as its factorization.

152638021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 152638021 is about 12354.6760783114. The cubic root of 152638021 is about 534.4259963005.

The spelling of 152638021 in words is "one hundred fifty-two million, six hundred thirty-eight thousand, twenty-one".