951656561 has 2 divisors, whose sum is σ = 951656562. Its totient is φ = 951656560.

The previous prime is 951656557. The next prime is 951656567. The reversal of 951656561 is 165656159.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 925072225 + 26584336 = 30415^2 + 5156^2 .

It is an emirp because it is prime and its reverse (165656159) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 951656561 - 2² = 951656557 is a prime.

It is not a weakly prime, because it can be changed into another prime (951656567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 475828280 + 475828281.

It is an arithmetic number, because the mean of its divisors is an integer number (475828281).

Almost surely, 2^951656561 is an apocalyptic number.

It is an amenable number.

951656561 is a deficient number, since it is larger than the sum of its proper divisors (1).

951656561 is an equidigital number, since it uses as much as digits as its factorization.

951656561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 243000, while the sum is 44.

The square root of 951656561 is about 30848.9312780848. The cubic root of 951656561 is about 983.6186365735.

The spelling of 951656561 in words is "nine hundred fifty-one million, six hundred fifty-six thousand, five hundred sixty-one".