961920637 has 4 divisors (see below), whose sum is σ = 962828316. Its totient is φ = 961012960.

The previous prime is 961920629. The next prime is 961920643. The reversal of 961920637 is 736029169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 736029169 = 11251 ⋅65419.

It can be written as a sum of positive squares in 2 ways, for example, as 626701156 + 335219481 = 25034^2 + 18309^2 .

It is a cyclic number.

It is not a de Polignac number, because 961920637 - 2³ = 961920629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 961920593 and 961920602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (961920647) 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, 452248 + ... + 454369.

It is an arithmetic number, because the mean of its divisors is an integer number (240707079).

Almost surely, 2^961920637 is an apocalyptic number.

It is an amenable number.

961920637 is a deficient number, since it is larger than the sum of its proper divisors (907679).

961920637 is a wasteful number, since it uses less digits than its factorization.

961920637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907678.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 961920637 is about 31014.8454292457. The cubic root of 961920637 is about 987.1422662349.

The spelling of 961920637 in words is "nine hundred sixty-one million, nine hundred twenty thousand, six hundred thirty-seven".