1656494947 has 2 divisors, whose sum is σ = 1656494948. Its totient is φ = 1656494946.

The previous prime is 1656494941. The next prime is 1656494953. The reversal of 1656494947 is 7494946561.

It is a balanced prime because it is at equal distance from previous prime (1656494941) and next prime (1656494953).

It is an emirp because it is prime and its reverse (7494946561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1656494947 - 2¹⁵ = 1656462179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1656494941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828247473 + 828247474.

It is an arithmetic number, because the mean of its divisors is an integer number (828247474).

Almost surely, 2^1656494947 is an apocalyptic number.

1656494947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656494947 is an equidigital number, since it uses as much as digits as its factorization.

1656494947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 55.

The square root of 1656494947 is about 40700.0607739104. The cubic root of 1656494947 is about 1183.2141965535.

The spelling of 1656494947 in words is "one billion, six hundred fifty-six million, four hundred ninety-four thousand, nine hundred forty-seven".