1620130251 has 4 divisors (see below), whose sum is σ = 2160173672. Its totient is φ = 1080086832.

The previous prime is 1620130249. The next prime is 1620130261. The reversal of 1620130251 is 1520310261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1520310261 = 3 ⋅506770087.

It is not a de Polignac number, because 1620130251 - 2¹ = 1620130249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620130231) 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, 270021706 + ... + 270021711.

It is an arithmetic number, because the mean of its divisors is an integer number (540043418).

Almost surely, 2^1620130251 is an apocalyptic number.

1620130251 is a deficient number, since it is larger than the sum of its proper divisors (540043421).

1620130251 is an equidigital number, since it uses as much as digits as its factorization.

1620130251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540043420.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1620130251 is about 40250.8416185302. The cubic root of 1620130251 is about 1174.4917677679.

The spelling of 1620130251 in words is "one billion, six hundred twenty million, one hundred thirty thousand, two hundred fifty-one".