1616631001 has 8 divisors (see below), whose sum is σ = 1628852040. Its totient is φ = 1604456448.

The previous prime is 1616630959. The next prime is 1616631043. The reversal of 1616631001 is 1001366161.

It is an interprime number because it is at equal distance from previous prime (1616630959) and next prime (1616631043).

It can be written as a sum of positive squares in 4 ways, for example, as 54405376 + 1562225625 = 7376^2 + 39525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1616631001 - 2⁹ = 1616630489 is a prime.

It is a super-2 number, since 2×1616631001² = 5226991586788524002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1616631091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59835 + ... + 82543.

It is an arithmetic number, because the mean of its divisors is an integer number (203606505).

Almost surely, 2^1616631001 is an apocalyptic number.

It is an amenable number.

1616631001 is a deficient number, since it is larger than the sum of its proper divisors (12221039).

1616631001 is a wasteful number, since it uses less digits than its factorization.

1616631001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23243.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1616631001 is about 40207.3500867690. The cubic root of 1616631001 is about 1173.6455800904.

Adding to 1616631001 its reverse (1001366161), we get a palindrome (2617997162).

The spelling of 1616631001 in words is "one billion, six hundred sixteen million, six hundred thirty-one thousand, one".