405131020145 has 8 divisors (see below), whose sum is σ = 486191069160. Its totient is φ = 324082252800.

The previous prime is 405131020097. The next prime is 405131020153. The reversal of 405131020145 is 541020131504.

It can be written as a sum of positive squares in 4 ways, for example, as 112544146576 + 292586873569 = 335476^2 + 540913^2 .

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

It is not a de Polignac number, because 405131020145 - 2¹² = 405131016049 is a prime.

It is a super-2 number, since 2×405131020145² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2741210 + ... + 2885219.

It is an arithmetic number, because the mean of its divisors is an integer number (60773883645).

Almost surely, 2^405131020145 is an apocalyptic number.

It is an amenable number.

405131020145 is a deficient number, since it is larger than the sum of its proper divisors (81060049015).

405131020145 is a wasteful number, since it uses less digits than its factorization.

405131020145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5640835.

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

Adding to 405131020145 its reverse (541020131504), we get a palindrome (946151151649).

The spelling of 405131020145 in words is "four hundred five billion, one hundred thirty-one million, twenty thousand, one hundred forty-five".