649701321 has 4 divisors (see below), whose sum is σ = 866268432. Its totient is φ = 433134212.

The previous prime is 649701307. The next prime is 649701323. The reversal of 649701321 is 123107946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649701321 is a prime.

It is a super-2 number, since 2×649701321² = 844223613018290082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649701323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108283551 + ... + 108283556.

It is an arithmetic number, because the mean of its divisors is an integer number (216567108).

Almost surely, 2^649701321 is an apocalyptic number.

It is an amenable number.

649701321 is a deficient number, since it is larger than the sum of its proper divisors (216567111).

649701321 is a wasteful number, since it uses less digits than its factorization.

649701321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216567110.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 649701321 is about 25489.2393177984. The cubic root of 649701321 is about 866.1064042800.

The spelling of 649701321 in words is "six hundred forty-nine million, seven hundred one thousand, three hundred twenty-one".