405001691 has 2 divisors, whose sum is σ = 405001692. Its totient is φ = 405001690.

The previous prime is 405001661. The next prime is 405001703. The reversal of 405001691 is 196100504.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405001691 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405001691.

It is not a weakly prime, because it can be changed into another prime (405001651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202500845 + 202500846.

It is an arithmetic number, because the mean of its divisors is an integer number (202500846).

Almost surely, 2^405001691 is an apocalyptic number.

405001691 is a deficient number, since it is larger than the sum of its proper divisors (1).

405001691 is an equidigital number, since it uses as much as digits as its factorization.

405001691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 405001691 is about 20124.6538106870. The cubic root of 405001691 is about 739.8646520174.

The spelling of 405001691 in words is "four hundred five million, one thousand, six hundred ninety-one".