2153238397 has 2 divisors, whose sum is σ = 2153238398. Its totient is φ = 2153238396.

The previous prime is 2153238383. The next prime is 2153238419. The reversal of 2153238397 is 7938323512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2007577636 + 145660761 = 44806^2 + 12069^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153238397 - 2¹⁵ = 2153205629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2153238317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076619198 + 1076619199.

It is an arithmetic number, because the mean of its divisors is an integer number (1076619199).

Almost surely, 2^2153238397 is an apocalyptic number.

It is an amenable number.

2153238397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153238397 is an equidigital number, since it uses as much as digits as its factorization.

2153238397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 2153238397 is about 46402.9998706980. Note that the first 3 decimals coincide. The cubic root of 2153238397 is about 1291.3105678111.

The spelling of 2153238397 in words is "two billion, one hundred fifty-three million, two hundred thirty-eight thousand, three hundred ninety-seven".