406451561 has 8 divisors (see below), whose sum is σ = 425889024. Its totient is φ = 387161280.

The previous prime is 406451557. The next prime is 406451593. The reversal of 406451561 is 165154604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 406451561 - 2² = 406451557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406454561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31121 + ... + 42206.

It is an arithmetic number, because the mean of its divisors is an integer number (53236128).

Almost surely, 2^406451561 is an apocalyptic number.

It is an amenable number.

406451561 is a deficient number, since it is larger than the sum of its proper divisors (19437463).

406451561 is a wasteful number, since it uses less digits than its factorization.

406451561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73591.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 406451561 is about 20160.6438637262. The cubic root of 406451561 is about 740.7464837568.

The spelling of 406451561 in words is "four hundred six million, four hundred fifty-one thousand, five hundred sixty-one".