1601650651 has 4 divisors (see below), whose sum is σ = 1610598600. Its totient is φ = 1592702704.

The previous prime is 1601650649. The next prime is 1601650663. The reversal of 1601650651 is 1560561061.

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 1601650651 - 2¹ = 1601650649 is a prime.

It is a super-3 number, since 3×1601650651³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601650601) 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, 4473706 + ... + 4474063.

It is an arithmetic number, because the mean of its divisors is an integer number (402649650).

Almost surely, 2^1601650651 is an apocalyptic number.

1601650651 is a deficient number, since it is larger than the sum of its proper divisors (8947949).

1601650651 is an equidigital number, since it uses as much as digits as its factorization.

1601650651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8947948.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1601650651 is about 40020.6278186637. The cubic root of 1601650651 is about 1170.0091681167.

The spelling of 1601650651 in words is "one billion, six hundred one million, six hundred fifty thousand, six hundred fifty-one".