999406501 has 2 divisors, whose sum is σ = 999406502. Its totient is φ = 999406500.

The previous prime is 999406483. The next prime is 999406547. The reversal of 999406501 is 105604999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995402500 + 4004001 = 31550^2 + 2001^2 .

It is a cyclic number.

It is not a de Polignac number, because 999406501 - 2¹¹ = 999404453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999406601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499703250 + 499703251.

It is an arithmetic number, because the mean of its divisors is an integer number (499703251).

Almost surely, 2^999406501 is an apocalyptic number.

It is an amenable number.

999406501 is a deficient number, since it is larger than the sum of its proper divisors (1).

999406501 is an equidigital number, since it uses as much as digits as its factorization.

999406501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 999406501 is about 31613.3911657702. The cubic root of 999406501 is about 999.8021278492.

The spelling of 999406501 in words is "nine hundred ninety-nine million, four hundred six thousand, five hundred one".