402512561 has 8 divisors (see below), whose sum is σ = 445290048. Its totient is φ = 360766000.

The previous prime is 402512543. The next prime is 402512611. The reversal of 402512561 is 165215204.

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 402512561 - 2⁶ = 402512497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402512561.

It is not an unprimeable number, because it can be changed into a prime (402512531) 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, 256910 + ... + 258471.

It is an arithmetic number, because the mean of its divisors is an integer number (55661256).

Almost surely, 2^402512561 is an apocalyptic number.

It is an amenable number.

402512561 is a deficient number, since it is larger than the sum of its proper divisors (42777487).

402512561 is a wasteful number, since it uses less digits than its factorization.

402512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515463.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 402512561 is about 20062.7156935446. The cubic root of 402512561 is about 738.3458064374.

Adding to 402512561 its reverse (165215204), we get a palindrome (567727765).

The spelling of 402512561 in words is "four hundred two million, five hundred twelve thousand, five hundred sixty-one".