720920051 has 4 divisors (see below), whose sum is σ = 721268232. Its totient is φ = 720571872.

The previous prime is 720920033. The next prime is 720920063. The reversal of 720920051 is 150029027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720920051 - 2⁶ = 720919987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720920051.

It is not an unprimeable number, because it can be changed into a prime (720920951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170966 + ... + 175131.

It is an arithmetic number, because the mean of its divisors is an integer number (180317058).

Almost surely, 2^720920051 is an apocalyptic number.

720920051 is a deficient number, since it is larger than the sum of its proper divisors (348181).

720920051 is a wasteful number, since it uses less digits than its factorization.

720920051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348180.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 720920051 is about 26849.9543947471. The cubic root of 720920051 is about 896.6625572672.

Adding to 720920051 its reverse (150029027), we get a palindrome (870949078).

The spelling of 720920051 in words is "seven hundred twenty million, nine hundred twenty thousand, fifty-one".