813421403 has 2 divisors, whose sum is σ = 813421404. Its totient is φ = 813421402.

The previous prime is 813421387. The next prime is 813421409. The reversal of 813421403 is 304124318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 813421403 - 2⁴ = 813421387 is a prime.

It is not a weakly prime, because it can be changed into another prime (813421409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406710701 + 406710702.

It is an arithmetic number, because the mean of its divisors is an integer number (406710702).

Almost surely, 2^813421403 is an apocalyptic number.

813421403 is a deficient number, since it is larger than the sum of its proper divisors (1).

813421403 is an equidigital number, since it uses as much as digits as its factorization.

813421403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 813421403 is about 28520.5435256764. The cubic root of 813421403 is about 933.4803889744.

The spelling of 813421403 in words is "eight hundred thirteen million, four hundred twenty-one thousand, four hundred three".