651545401 has 4 divisors (see below), whose sum is σ = 701664292. Its totient is φ = 601426512.

The previous prime is 651545381. The next prime is 651545413. The reversal of 651545401 is 104545156.

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 50069776 + 601475625 = 7076^2 + 24525^2 .

It is a cyclic number.

It is not a de Polignac number, because 651545401 - 2⁵ = 651545369 is a prime.

It is a super-2 number, since 2×651545401² = 849022819128501602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651545431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25059426 + ... + 25059451.

It is an arithmetic number, because the mean of its divisors is an integer number (175416073).

Almost surely, 2^651545401 is an apocalyptic number.

It is an amenable number.

651545401 is a deficient number, since it is larger than the sum of its proper divisors (50118891).

651545401 is a wasteful number, since it uses less digits than its factorization.

651545401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50118890.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 651545401 is about 25525.3873819772. The cubic root of 651545401 is about 866.9250680340.

The spelling of 651545401 in words is "six hundred fifty-one million, five hundred forty-five thousand, four hundred one".