1620525213 has 6 divisors (see below), whose sum is σ = 2340758654. Its totient is φ = 1080350136.

The previous prime is 1620525209. The next prime is 1620525227. The reversal of 1620525213 is 3125250261.

It is a happy number.

1620525213 is a `hidden beast` number, since 1 + 620 + 5 + 25 + 2 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1541190564 + 79334649 = 39258^2 + 8907^2 .

It is not a de Polignac number, because 1620525213 - 2² = 1620525209 is a prime.

It is a super-2 number, since 2×1620525213² = 5252203931937390738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620525253) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 90029170 + ... + 90029187.

Almost surely, 2^1620525213 is an apocalyptic number.

It is an amenable number.

1620525213 is a deficient number, since it is larger than the sum of its proper divisors (720233441).

1620525213 is a wasteful number, since it uses less digits than its factorization.

1620525213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180058363 (or 180058360 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1620525213 is about 40255.7475772094. The cubic root of 1620525213 is about 1174.5872008207.

Adding to 1620525213 its reverse (3125250261), we get a palindrome (4745775474).

The spelling of 1620525213 in words is "one billion, six hundred twenty million, five hundred twenty-five thousand, two hundred thirteen".