612731506 has 8 divisors (see below), whose sum is σ = 920598444. Its totient is φ = 305865360.

The previous prime is 612731503. The next prime is 612731659. The reversal of 612731506 is 605137216.

It can be written as a sum of positive squares in 2 ways, for example, as 537822481 + 74909025 = 23191^2 + 8655^2 .

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

It is not an unprimeable number, because it can be changed into a prime (612731501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248665 + ... + 251116.

Almost surely, 2^612731506 is an apocalyptic number.

612731506 is a deficient number, since it is larger than the sum of its proper divisors (307866938).

612731506 is a wasteful number, since it uses less digits than its factorization.

612731506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500396.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 612731506 is about 24753.4140271600. The cubic root of 612731506 is about 849.3566093148.

The spelling of 612731506 in words is "six hundred twelve million, seven hundred thirty-one thousand, five hundred six".