2151776747 has 2 divisors, whose sum is σ = 2151776748. Its totient is φ = 2151776746.

The previous prime is 2151776659. The next prime is 2151776749. The reversal of 2151776747 is 7476771512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2151776747 - 2⁸ = 2151776491 is a prime.

Together with 2151776749, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2151776749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075888373 + 1075888374.

It is an arithmetic number, because the mean of its divisors is an integer number (1075888374).

Almost surely, 2^2151776747 is an apocalyptic number.

2151776747 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151776747 is an equidigital number, since it uses as much as digits as its factorization.

2151776747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576240, while the sum is 47.

The square root of 2151776747 is about 46387.2476764897. The cubic root of 2151776747 is about 1291.0183147827.

The spelling of 2151776747 in words is "two billion, one hundred fifty-one million, seven hundred seventy-six thousand, seven hundred forty-seven".