420631531546 has 4 divisors (see below), whose sum is σ = 630947297322. Its totient is φ = 210315765772.

The previous prime is 420631531543. The next prime is 420631531547. The reversal of 420631531546 is 645135136024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 348920583025 + 71710948521 = 590695^2 + 267789^2 .

It is a junction number, because it is equal to n+sod(n) for n = 420631531499 and 420631531508.

It is not an unprimeable number, because it can be changed into a prime (420631531543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105157882885 + ... + 105157882888.

Almost surely, 2^420631531546 is an apocalyptic number.

420631531546 is a deficient number, since it is larger than the sum of its proper divisors (210315765776).

420631531546 is a wasteful number, since it uses less digits than its factorization.

420631531546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210315765775.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 420631531546 in words is "four hundred twenty billion, six hundred thirty-one million, five hundred thirty-one thousand, five hundred forty-six".