649513281 has 8 divisors (see below), whose sum is σ = 889423744. Its totient is φ = 421305840.

The previous prime is 649513279. The next prime is 649513283. The reversal of 649513281 is 182315946.

It is an interprime number because it is at equal distance from previous prime (649513279) and next prime (649513283).

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

It is not a de Polignac number, because 649513281 - 2¹ = 649513279 is a prime.

It is a super-2 number, since 2×649513281² = 843735004390769922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649513283) 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, 2925625 + ... + 2925846.

It is an arithmetic number, because the mean of its divisors is an integer number (111177968).

Almost surely, 2^649513281 is an apocalyptic number.

It is an amenable number.

649513281 is a deficient number, since it is larger than the sum of its proper divisors (239910463).

649513281 is a wasteful number, since it uses less digits than its factorization.

649513281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5851511.

The product of its digits is 51840, while the sum is 39.

The square root of 649513281 is about 25485.5504354919. The cubic root of 649513281 is about 866.0228385154.

The spelling of 649513281 in words is "six hundred forty-nine million, five hundred thirteen thousand, two hundred eighty-one".