651438099 has 16 divisors (see below), whose sum is σ = 1039332000. Its totient is φ = 400884768.

The previous prime is 651438043. The next prime is 651438103. The reversal of 651438099 is 990834156.

It is a happy number.

It is not a de Polignac number, because 651438099 - 2²¹ = 649340947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651438019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 927624 + ... + 928325.

It is an arithmetic number, because the mean of its divisors is an integer number (64958250).

Almost surely, 2^651438099 is an apocalyptic number.

651438099 is a deficient number, since it is larger than the sum of its proper divisors (387893901).

651438099 is a wasteful number, since it uses less digits than its factorization.

651438099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855971 (or 1855965 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 651438099 is about 25523.2854272329. The cubic root of 651438099 is about 866.8774745737.

The spelling of 651438099 in words is "six hundred fifty-one million, four hundred thirty-eight thousand, ninety-nine".