649874251 has 8 divisors (see below), whose sum is σ = 709452800. Its totient is φ = 591665472.

The previous prime is 649874243. The next prime is 649874263. The reversal of 649874251 is 152478946.

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

It is a cyclic number.

It is not a de Polignac number, because 649874251 - 2³ = 649874243 is a prime.

It is a super-2 number, since 2×649874251² = 844673084225622002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649874051) 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, 341451 + ... + 343348.

It is an arithmetic number, because the mean of its divisors is an integer number (88681600).

Almost surely, 2^649874251 is an apocalyptic number.

649874251 is a deficient number, since it is larger than the sum of its proper divisors (59578549).

649874251 is a wasteful number, since it uses less digits than its factorization.

649874251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684885.

The product of its digits is 483840, while the sum is 46.

The square root of 649874251 is about 25492.6313078897. The cubic root of 649874251 is about 866.1832408658.

The spelling of 649874251 in words is "six hundred forty-nine million, eight hundred seventy-four thousand, two hundred fifty-one".