649208451 has 16 divisors (see below), whose sum is σ = 881515008. Its totient is φ = 424905600.

The previous prime is 649208449. The next prime is 649208459. The reversal of 649208451 is 154802946.

It is not a de Polignac number, because 649208451 - 2¹ = 649208449 is a prime.

It is a super-2 number, since 2×649208451² = 842943225699638802, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649208459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45010 + ... + 57656.

It is an arithmetic number, because the mean of its divisors is an integer number (55094688).

Almost surely, 2^649208451 is an apocalyptic number.

649208451 is a deficient number, since it is larger than the sum of its proper divisors (232306557).

649208451 is a wasteful number, since it uses less digits than its factorization.

649208451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12962.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 649208451 is about 25479.5692859985. The cubic root of 649208451 is about 865.8873365126.

The spelling of 649208451 in words is "six hundred forty-nine million, two hundred eight thousand, four hundred fifty-one".