651271249 has 4 divisors (see below), whose sum is σ = 666417136. Its totient is φ = 636125364.

The previous prime is 651271237. The next prime is 651271253. The reversal of 651271249 is 942172156.

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 not a de Polignac number, because 651271249 - 2⁷ = 651271121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651271349) 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, 7572879 + ... + 7572964.

It is an arithmetic number, because the mean of its divisors is an integer number (166604284).

Almost surely, 2^651271249 is an apocalyptic number.

It is an amenable number.

651271249 is a deficient number, since it is larger than the sum of its proper divisors (15145887).

651271249 is a wasteful number, since it uses less digits than its factorization.

651271249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15145886.

The product of its digits is 30240, while the sum is 37.

The square root of 651271249 is about 25520.0166340071. The cubic root of 651271249 is about 866.8034584048.

The spelling of 651271249 in words is "six hundred fifty-one million, two hundred seventy-one thousand, two hundred forty-nine".