720136451 has 2 divisors, whose sum is σ = 720136452. Its totient is φ = 720136450.

The previous prime is 720136447. The next prime is 720136453. The reversal of 720136451 is 154631027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720136451 - 2² = 720136447 is a prime.

Together with 720136453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (720136453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360068225 + 360068226.

It is an arithmetic number, because the mean of its divisors is an integer number (360068226).

Almost surely, 2^720136451 is an apocalyptic number.

720136451 is a deficient number, since it is larger than the sum of its proper divisors (1).

720136451 is an equidigital number, since it uses as much as digits as its factorization.

720136451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 720136451 is about 26835.3582238061. The cubic root of 720136451 is about 896.3375653794.

Adding to 720136451 its reverse (154631027), we get a palindrome (874767478).

The spelling of 720136451 in words is "seven hundred twenty million, one hundred thirty-six thousand, four hundred fifty-one".