1531312730 has 8 divisors (see below), whose sum is σ = 2756362932. Its totient is φ = 612525088.

The previous prime is 1531312709. The next prime is 1531312753. The reversal of 1531312730 is 372131351.

It can be written as a sum of positive squares in 2 ways, for example, as 1529826769 + 1485961 = 39113^2 + 1219^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1531312730.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76565627 + ... + 76565646.

Almost surely, 2^1531312730 is an apocalyptic number.

1531312730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1531312730 is a deficient number, since it is larger than the sum of its proper divisors (1225050202).

1531312730 is a wasteful number, since it uses less digits than its factorization.

1531312730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153131280.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 1531312730 is about 39131.9911325759. The cubic root of 1531312730 is about 1152.6248122646.

The spelling of 1531312730 in words is "one billion, five hundred thirty-one million, three hundred twelve thousand, seven hundred thirty".