953878421 has 2 divisors, whose sum is σ = 953878422. Its totient is φ = 953878420.

The previous prime is 953878399. The next prime is 953878423. The reversal of 953878421 is 124878359.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 772006225 + 181872196 = 27785^2 + 13486^2 .

It is a cyclic number.

It is not a de Polignac number, because 953878421 - 2¹⁸ = 953616277 is a prime.

It is a Sophie Germain prime.

Together with 953878423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (953878423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 476939210 + 476939211.

It is an arithmetic number, because the mean of its divisors is an integer number (476939211).

Almost surely, 2^953878421 is an apocalyptic number.

It is an amenable number.

953878421 is a deficient number, since it is larger than the sum of its proper divisors (1).

953878421 is an equidigital number, since it uses as much as digits as its factorization.

953878421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 953878421 is about 30884.9222275207. The cubic root of 953878421 is about 984.3835358642.

The spelling of 953878421 in words is "nine hundred fifty-three million, eight hundred seventy-eight thousand, four hundred twenty-one".