1601651206 has 4 divisors (see below), whose sum is σ = 2402476812. Its totient is φ = 800825602.

The previous prime is 1601651201. The next prime is 1601651251. The reversal of 1601651206 is 6021561061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6021561061 = 14897 ⋅404213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601651201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400412800 + ... + 400412803.

It is an arithmetic number, because the mean of its divisors is an integer number (600619203).

Almost surely, 2^1601651206 is an apocalyptic number.

1601651206 is a deficient number, since it is larger than the sum of its proper divisors (800825606).

1601651206 is an equidigital number, since it uses as much as digits as its factorization.

1601651206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800825605.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1601651206 is about 40020.6347525873. The cubic root of 1601651206 is about 1170.0093032596.

The spelling of 1601651206 in words is "one billion, six hundred one million, six hundred fifty-one thousand, two hundred six".