1620957353 has 4 divisors (see below), whose sum is σ = 1651541508. Its totient is φ = 1590373200.

The previous prime is 1620957343. The next prime is 1620957379. The reversal of 1620957353 is 3537590261.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1283573929 + 337383424 = 35827^2 + 18368^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620957353 - 2⁴ = 1620957337 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620957353.

It is not an unprimeable number, because it can be changed into a prime (1620957343) 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, 15291998 + ... + 15292103.

It is an arithmetic number, because the mean of its divisors is an integer number (412885377).

Almost surely, 2^1620957353 is an apocalyptic number.

It is an amenable number.

1620957353 is a deficient number, since it is larger than the sum of its proper divisors (30584155).

1620957353 is an equidigital number, since it uses as much as digits as its factorization.

1620957353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30584154.

The product of its (nonzero) digits is 170100, while the sum is 41.

The square root of 1620957353 is about 40261.1146517331. The cubic root of 1620957353 is about 1174.6915992788.

The spelling of 1620957353 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, three hundred fifty-three".