2158253849 has 2 divisors, whose sum is σ = 2158253850. Its totient is φ = 2158253848.

The previous prime is 2158253837. The next prime is 2158253857. The reversal of 2158253849 is 9483528512.

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., 1342123225 + 816130624 = 36635^2 + 28568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2158253849 is a prime.

It is not a weakly prime, because it can be changed into another prime (2158243849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079126924 + 1079126925.

It is an arithmetic number, because the mean of its divisors is an integer number (1079126925).

Almost surely, 2^2158253849 is an apocalyptic number.

It is an amenable number.

2158253849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158253849 is an equidigital number, since it uses as much as digits as its factorization.

2158253849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 691200, while the sum is 47.

The square root of 2158253849 is about 46457.0107626395. The cubic root of 2158253849 is about 1292.3123897161.

The spelling of 2158253849 in words is "two billion, one hundred fifty-eight million, two hundred fifty-three thousand, eight hundred forty-nine".