820628951 has 2 divisors, whose sum is σ = 820628952. Its totient is φ = 820628950.

The previous prime is 820628929. The next prime is 820628971. The reversal of 820628951 is 159826028.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 820628951 - 2¹⁴ = 820612567 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 820628899 and 820628908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820628911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410314475 + 410314476.

It is an arithmetic number, because the mean of its divisors is an integer number (410314476).

Almost surely, 2^820628951 is an apocalyptic number.

820628951 is a deficient number, since it is larger than the sum of its proper divisors (1).

820628951 is an equidigital number, since it uses as much as digits as its factorization.

820628951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 820628951 is about 28646.6219823560. The cubic root of 820628951 is about 936.2294068268.

The spelling of 820628951 in words is "eight hundred twenty million, six hundred twenty-eight thousand, nine hundred fifty-one".