630961 has 4 divisors (see below), whose sum is σ = 648052. Its totient is φ = 613872.

The previous prime is 630941. The next prime is 630967. The reversal of 630961 is 169036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 414736 + 216225 = 644^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 630961 - 2¹¹ = 628913 is a prime.

It is a super-2 number, since 2×630961² = 796223567042, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

630961 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630967) 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, 8490 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (162013).

2⁶³⁰⁹⁶¹ is an apocalyptic number.

It is an amenable number.

630961 is a deficient number, since it is larger than the sum of its proper divisors (17091).

630961 is a wasteful number, since it uses less digits than its factorization.

630961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17090.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 630961 is about 794.3305357343. The cubic root of 630961 is about 85.7697554972.

Adding to 630961 its reverse (169036), we get a palindrome (799997).

The spelling of 630961 in words is "six hundred thirty thousand, nine hundred sixty-one".