1625161331 has 4 divisors (see below), whose sum is σ = 1644741672. Its totient is φ = 1605580992.

The previous prime is 1625161277. The next prime is 1625161361. The reversal of 1625161331 is 1331615261.

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 1625161331 - 2¹⁴ = 1625144947 is a prime.

It is a super-2 number, since 2×1625161331² = 5282298703555383122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1625161294 and 1625161303.

It is not an unprimeable number, because it can be changed into a prime (1625161361) 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, 9790046 + ... + 9790211.

It is an arithmetic number, because the mean of its divisors is an integer number (411185418).

Almost surely, 2^1625161331 is an apocalyptic number.

1625161331 is a deficient number, since it is larger than the sum of its proper divisors (19580341).

1625161331 is an equidigital number, since it uses as much as digits as its factorization.

1625161331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19580340.

The product of its digits is 3240, while the sum is 29.

The square root of 1625161331 is about 40313.2897566051. The cubic root of 1625161331 is about 1175.7062495653.

Adding to 1625161331 its reverse (1331615261), we get a palindrome (2956776592).

The spelling of 1625161331 in words is "one billion, six hundred twenty-five million, one hundred sixty-one thousand, three hundred thirty-one".