2156647547 has 2 divisors, whose sum is σ = 2156647548. Its totient is φ = 2156647546.

The previous prime is 2156647529. The next prime is 2156647567. The reversal of 2156647547 is 7457466512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156647547 - 2¹⁶ = 2156582011 is a prime.

It is a super-2 number, since 2×2156647547² = 9302257283962234418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2156647567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078323773 + 1078323774.

It is an arithmetic number, because the mean of its divisors is an integer number (1078323774).

Almost surely, 2^2156647547 is an apocalyptic number.

2156647547 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156647547 is an equidigital number, since it uses as much as digits as its factorization.

2156647547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 47.

The square root of 2156647547 is about 46439.7194974302. The cubic root of 2156647547 is about 1291.9917046741.

The spelling of 2156647547 in words is "two billion, one hundred fifty-six million, six hundred forty-seven thousand, five hundred forty-seven".