616451947 has 2 divisors, whose sum is σ = 616451948. Its totient is φ = 616451946.

The previous prime is 616451939. The next prime is 616451959. The reversal of 616451947 is 749154616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616451947 - 2³ = 616451939 is a prime.

It is not a weakly prime, because it can be changed into another prime (616451987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308225973 + 308225974.

It is an arithmetic number, because the mean of its divisors is an integer number (308225974).

Almost surely, 2^616451947 is an apocalyptic number.

616451947 is a deficient number, since it is larger than the sum of its proper divisors (1).

616451947 is an equidigital number, since it uses as much as digits as its factorization.

616451947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 616451947 is about 24828.4503543818. The cubic root of 616451947 is about 851.0722095513.

The spelling of 616451947 in words is "six hundred sixteen million, four hundred fifty-one thousand, nine hundred forty-seven".