651404361 has 4 divisors (see below), whose sum is σ = 868539152. Its totient is φ = 434269572.

The previous prime is 651404357. The next prime is 651404371. The reversal of 651404361 is 163404156.

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 not a de Polignac number, because 651404361 - 2² = 651404357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651404311) 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, 108567391 + ... + 108567396.

It is an arithmetic number, because the mean of its divisors is an integer number (217134788).

Almost surely, 2^651404361 is an apocalyptic number.

It is an amenable number.

651404361 is a deficient number, since it is larger than the sum of its proper divisors (217134791).

651404361 is a wasteful number, since it uses less digits than its factorization.

651404361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217134790.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 651404361 is about 25522.6244927907. The cubic root of 651404361 is about 866.8625091112.

The spelling of 651404361 in words is "six hundred fifty-one million, four hundred four thousand, three hundred sixty-one".