1620131 has 4 divisors (see below), whose sum is σ = 1629264. Its totient is φ = 1611000.

The previous prime is 1620121. The next prime is 1620133. The reversal of 1620131 is 1310261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620131 - 2¹⁴ = 1603747 is a prime.

It is a super-2 number, since 2×1620131² = 5249648914322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620133) 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, 4295 + ... + 4656.

It is an arithmetic number, because the mean of its divisors is an integer number (407316).

2^1620131 is an apocalyptic number.

1620131 is a deficient number, since it is larger than the sum of its proper divisors (9133).

1620131 is an equidigital number, since it uses as much as digits as its factorization.

1620131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9132.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1620131 is about 1272.8436667557. The cubic root of 1620131 is about 117.4491948760.

Adding to 1620131 its reverse (1310261), we get a palindrome (2930392).

The spelling of 1620131 in words is "one million, six hundred twenty thousand, one hundred thirty-one".