1626890081 has 4 divisors (see below), whose sum is σ = 1631323392. Its totient is φ = 1622456772.

The previous prime is 1626890071. The next prime is 1626890099. The reversal of 1626890081 is 1800986261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1626890081 - 2⁶ = 1626890017 is a prime.

It is a super-2 number, since 2×1626890081² = 5293542671312373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1626890011) 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, 2216105 + ... + 2216838.

It is an arithmetic number, because the mean of its divisors is an integer number (407830848).

Almost surely, 2^1626890081 is an apocalyptic number.

It is an amenable number.

1626890081 is a deficient number, since it is larger than the sum of its proper divisors (4433311).

1626890081 is an equidigital number, since it uses as much as digits as its factorization.

1626890081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4433310.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 1626890081 is about 40334.7254980123. The cubic root of 1626890081 is about 1176.1229839701.

The spelling of 1626890081 in words is "one billion, six hundred twenty-six million, eight hundred ninety thousand, eighty-one".