649426237 has 4 divisors (see below), whose sum is σ = 649952476. Its totient is φ = 648900000.

The previous prime is 649426201. The next prime is 649426241. The reversal of 649426237 is 732624946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 732624946 = 2 ⋅366312473.

It can be written as a sum of positive squares in 2 ways, for example, as 390023001 + 259403236 = 19749^2 + 16106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649426237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649426193 and 649426202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649426247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261264 + ... + 263737.

It is an arithmetic number, because the mean of its divisors is an integer number (162488119).

Almost surely, 2^649426237 is an apocalyptic number.

It is an amenable number.

649426237 is a deficient number, since it is larger than the sum of its proper divisors (526239).

649426237 is a wasteful number, since it uses less digits than its factorization.

649426237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526238.

The product of its digits is 435456, while the sum is 43.

The square root of 649426237 is about 25483.8426655008. The cubic root of 649426237 is about 865.9841503356.

The spelling of 649426237 in words is "six hundred forty-nine million, four hundred twenty-six thousand, two hundred thirty-seven".