2151277649 has 2 divisors, whose sum is σ = 2151277650. Its totient is φ = 2151277648.

The previous prime is 2151277621. The next prime is 2151277721. The reversal of 2151277649 is 9467721512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2121247249 + 30030400 = 46057^2 + 5480^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151277649 - 2²⁰ = 2150229073 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151277619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075638824 + 1075638825.

It is an arithmetic number, because the mean of its divisors is an integer number (1075638825).

Almost surely, 2^2151277649 is an apocalyptic number.

It is an amenable number.

2151277649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151277649 is an equidigital number, since it uses as much as digits as its factorization.

2151277649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 2151277649 is about 46381.8676747714. The cubic root of 2151277649 is about 1290.9184911549.

The spelling of 2151277649 in words is "two billion, one hundred fifty-one million, two hundred seventy-seven thousand, six hundred forty-nine".