421956761 has 2 divisors, whose sum is σ = 421956762. Its totient is φ = 421956760.

The previous prime is 421956751. The next prime is 421956791. The reversal of 421956761 is 167659124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 414366736 + 7590025 = 20356^2 + 2755^2 .

It is a cyclic number.

It is not a de Polignac number, because 421956761 - 2¹⁸ = 421694617 is a prime.

It is a super-2 number, since 2×421956761² = 356095016307222242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (421956751) 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, 210978380 + 210978381.

It is an arithmetic number, because the mean of its divisors is an integer number (210978381).

Almost surely, 2^421956761 is an apocalyptic number.

It is an amenable number.

421956761 is a deficient number, since it is larger than the sum of its proper divisors (1).

421956761 is an equidigital number, since it uses as much as digits as its factorization.

421956761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 421956761 is about 20541.5861364209. The cubic root of 421956761 is about 750.0484478333.

The spelling of 421956761 in words is "four hundred twenty-one million, nine hundred fifty-six thousand, seven hundred sixty-one".