2157150649 has 2 divisors, whose sum is σ = 2157150650. Its totient is φ = 2157150648.

The previous prime is 2157150571. The next prime is 2157150679. The reversal of 2157150649 is 9460517512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1260747049 + 896403600 = 35507^2 + 29940^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157150649 - 2¹⁹ = 2156626361 is a prime.

It is a super-2 number, since 2×2157150649² = 9306597844962242402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2157150679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078575324 + 1078575325.

It is an arithmetic number, because the mean of its divisors is an integer number (1078575325).

Almost surely, 2^2157150649 is an apocalyptic number.

It is an amenable number.

2157150649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157150649 is an equidigital number, since it uses as much as digits as its factorization.

2157150649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 2157150649 is about 46445.1359024818. The cubic root of 2157150649 is about 1292.0921619902.

The spelling of 2157150649 in words is "two billion, one hundred fifty-seven million, one hundred fifty thousand, six hundred forty-nine".