2158967849 has 2 divisors, whose sum is σ = 2158967850. Its totient is φ = 2158967848.

The previous prime is 2158967827. The next prime is 2158967861. The reversal of 2158967849 is 9487698512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1391290000 + 767677849 = 37300^2 + 27707^2 .

It is a cyclic number.

It is not a de Polignac number, because 2158967849 - 2¹⁶ = 2158902313 is a prime.

It is a super-2 number, since 2×2158967849² = 9322284346031373602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2158967809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1079483924 + 1079483925.

It is an arithmetic number, because the mean of its divisors is an integer number (1079483925).

Almost surely, 2^2158967849 is an apocalyptic number.

It is an amenable number.

2158967849 is a deficient number, since it is larger than the sum of its proper divisors (1).

2158967849 is an equidigital number, since it uses as much as digits as its factorization.

2158967849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 59.

The square root of 2158967849 is about 46464.6946508852. The cubic root of 2158967849 is about 1292.4548828885.

The spelling of 2158967849 in words is "two billion, one hundred fifty-eight million, nine hundred sixty-seven thousand, eight hundred forty-nine".