649971461 has 8 divisors (see below), whose sum is σ = 679044600. Its totient is φ = 621342400.

The previous prime is 649971433. The next prime is 649971479. The reversal of 649971461 is 164179946.

It can be written as a sum of positive squares in 4 ways, for example, as 353064100 + 296907361 = 18790^2 + 17231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649971461 - 2¹⁰ = 649970437 is a prime.

It is a super-2 number, since 2×649971461² = 844925800228949042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649971431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108026 + ... + 113883.

It is an arithmetic number, because the mean of its divisors is an integer number (84880575).

Almost surely, 2^649971461 is an apocalyptic number.

It is an amenable number.

649971461 is a deficient number, since it is larger than the sum of its proper divisors (29073139).

649971461 is a wasteful number, since it uses less digits than its factorization.

649971461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222039.

The product of its digits is 326592, while the sum is 47.

The square root of 649971461 is about 25494.5378659822. The cubic root of 649971461 is about 866.2264274129.

The spelling of 649971461 in words is "six hundred forty-nine million, nine hundred seventy-one thousand, four hundred sixty-one".