651504949 has 4 divisors (see below), whose sum is σ = 662185420. Its totient is φ = 640824480.

The previous prime is 651504947. The next prime is 651504967. The reversal of 651504949 is 949405156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165302449 + 486202500 = 12857^2 + 22050^2 .

It is a cyclic number.

It is not a de Polignac number, because 651504949 - 2¹ = 651504947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651504947) 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, 5340144 + ... + 5340265.

It is an arithmetic number, because the mean of its divisors is an integer number (165546355).

Almost surely, 2^651504949 is an apocalyptic number.

It is an amenable number.

651504949 is a deficient number, since it is larger than the sum of its proper divisors (10680471).

651504949 is a wasteful number, since it uses less digits than its factorization.

651504949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10680470.

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 651504949 is about 25524.5949820952. The cubic root of 651504949 is about 866.9071262920.

The spelling of 651504949 in words is "six hundred fifty-one million, five hundred four thousand, nine hundred forty-nine".