1601399101 has 4 divisors (see below), whose sum is σ = 1606014432. Its totient is φ = 1596783772.

The previous prime is 1601399089. The next prime is 1601399117. The reversal of 1601399101 is 1019931061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1019931061 = 43 ⋅23719327.

It is a cyclic number.

It is not a de Polignac number, because 1601399101 - 2²³ = 1593010493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601399141) 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, 2307145 + ... + 2307838.

It is an arithmetic number, because the mean of its divisors is an integer number (401503608).

Almost surely, 2^1601399101 is an apocalyptic number.

It is an amenable number.

1601399101 is a deficient number, since it is larger than the sum of its proper divisors (4615331).

1601399101 is an equidigital number, since it uses as much as digits as its factorization.

1601399101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4615330.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 1601399101 is about 40017.4849409605. The cubic root of 1601399101 is about 1169.9479123084.

The spelling of 1601399101 in words is "one billion, six hundred one million, three hundred ninety-nine thousand, one hundred one".