405001261 has 4 divisors (see below), whose sum is σ = 462858592. Its totient is φ = 347143932.

The previous prime is 405001243. The next prime is 405001277. The reversal of 405001261 is 162100504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 405001261 - 2⁵ = 405001229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405001291) 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 in 3 ways as a sum of consecutive naturals, for example, 28928655 + ... + 28928668.

It is an arithmetic number, because the mean of its divisors is an integer number (115714648).

Almost surely, 2^405001261 is an apocalyptic number.

It is an amenable number.

405001261 is a deficient number, since it is larger than the sum of its proper divisors (57857331).

405001261 is an equidigital number, since it uses as much as digits as its factorization.

405001261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57857330.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 405001261 is about 20124.6431272706. The cubic root of 405001261 is about 739.8643901733.

Adding to 405001261 its reverse (162100504), we get a palindrome (567101765).

The spelling of 405001261 in words is "four hundred five million, one thousand, two hundred sixty-one".