651085871 has 2 divisors, whose sum is σ = 651085872. Its totient is φ = 651085870.

The previous prime is 651085861. The next prime is 651085921. The reversal of 651085871 is 178580156.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 651085871 - 2²⁶ = 583977007 is a prime.

It is a super-2 number, since 2×651085871² = 847825622831657282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (651085811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325542935 + 325542936.

It is an arithmetic number, because the mean of its divisors is an integer number (325542936).

Almost surely, 2^651085871 is an apocalyptic number.

651085871 is a deficient number, since it is larger than the sum of its proper divisors (1).

651085871 is an equidigital number, since it uses as much as digits as its factorization.

651085871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 41.

The square root of 651085871 is about 25516.3843637769. The cubic root of 651085871 is about 866.7212082210.

The spelling of 651085871 in words is "six hundred fifty-one million, eighty-five thousand, eight hundred seventy-one".