649971479 has 2 divisors, whose sum is σ = 649971480. Its totient is φ = 649971478.

The previous prime is 649971433. The next prime is 649971493. The reversal of 649971479 is 974179946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649971479 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649971379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324985739 + 324985740.

It is an arithmetic number, because the mean of its divisors is an integer number (324985740).

Almost surely, 2^649971479 is an apocalyptic number.

649971479 is a deficient number, since it is larger than the sum of its proper divisors (1).

649971479 is an equidigital number, since it uses as much as digits as its factorization.

649971479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 649971479 is about 25494.5382189990. The cubic root of 649971479 is about 866.2264354092.

The spelling of 649971479 in words is "six hundred forty-nine million, nine hundred seventy-one thousand, four hundred seventy-nine".