1231621730 has 8 divisors (see below), whose sum is σ = 2216919132. Its totient is φ = 492648688.

The previous prime is 1231621717. The next prime is 1231621757. The reversal of 1231621730 is 371261321.

It can be written as a sum of positive squares in 2 ways, for example, as 1173816121 + 57805609 = 34261^2 + 7603^2 .

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 1231621730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61581077 + ... + 61581096.

Almost surely, 2^1231621730 is an apocalyptic number.

1231621730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231621730 is a deficient number, since it is larger than the sum of its proper divisors (985297402).

1231621730 is a wasteful number, since it uses less digits than its factorization.

1231621730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123162180.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1231621730 is about 35094.4686524814. The cubic root of 1231621730 is about 1071.9119540677.

The spelling of 1231621730 in words is "one billion, two hundred thirty-one million, six hundred twenty-one thousand, seven hundred thirty".