961649743 has 4 divisors (see below), whose sum is σ = 961850160. Its totient is φ = 961449328.

The previous prime is 961649723. The next prime is 961649747. The reversal of 961649743 is 347946169.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 347946169 = 13553 ⋅25673.

It is a cyclic number.

It is not a de Polignac number, because 961649743 - 2¹⁷ = 961518671 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 (961649747) 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, 92830 + ... + 102667.

It is an arithmetic number, because the mean of its divisors is an integer number (240462540).

Almost surely, 2^961649743 is an apocalyptic number.

961649743 is a deficient number, since it is larger than the sum of its proper divisors (200417).

961649743 is a wasteful number, since it uses less digits than its factorization.

961649743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200416.

The product of its digits is 979776, while the sum is 49.

The square root of 961649743 is about 31010.4779550396. The cubic root of 961649743 is about 987.0495919147.

The spelling of 961649743 in words is "nine hundred sixty-one million, six hundred forty-nine thousand, seven hundred forty-three".