951661021 has 2 divisors, whose sum is σ = 951661022. Its totient is φ = 951661020.

The previous prime is 951661001. The next prime is 951661031. The reversal of 951661021 is 120166159.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 580135396 + 371525625 = 24086^2 + 19275^2 .

It is an emirp because it is prime and its reverse (120166159) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 951661021 - 2⁵ = 951660989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (951661001) 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 as a sum of consecutive naturals, namely, 475830510 + 475830511.

It is an arithmetic number, because the mean of its divisors is an integer number (475830511).

Almost surely, 2^951661021 is an apocalyptic number.

It is an amenable number.

951661021 is a deficient number, since it is larger than the sum of its proper divisors (1).

951661021 is an equidigital number, since it uses as much as digits as its factorization.

951661021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 951661021 is about 30849.0035657556. The cubic root of 951661021 is about 983.6201731685.

The spelling of 951661021 in words is "nine hundred fifty-one million, six hundred sixty-one thousand, twenty-one".