1621315745 has 8 divisors (see below), whose sum is σ = 2223518784. Its totient is φ = 1111759344.

The previous prime is 1621315727. The next prime is 1621315757. The reversal of 1621315745 is 5475131261.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1621315745 - 2¹² = 1621311649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 46323307 = 1621315745 / (1 + 6 + 2 + 1 + 3 + 1 + 5 + 7 + 4 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23161619 + ... + 23161688.

It is an arithmetic number, because the mean of its divisors is an integer number (277939848).

Almost surely, 2^1621315745 is an apocalyptic number.

It is an amenable number.

1621315745 is a deficient number, since it is larger than the sum of its proper divisors (602203039).

1621315745 is an equidigital number, since it uses as much as digits as its factorization.

1621315745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46323319.

The product of its digits is 25200, while the sum is 35.

The square root of 1621315745 is about 40265.5652512168. The cubic root of 1621315745 is about 1174.7781672664.

The spelling of 1621315745 in words is "one billion, six hundred twenty-one million, three hundred fifteen thousand, seven hundred forty-five".