787840961 has 4 divisors (see below), whose sum is σ = 790530132. Its totient is φ = 785151792.

The previous prime is 787840939. The next prime is 787840967. The reversal of 787840961 is 169048787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 169048787 = 97 ⋅1742771.

It can be written as a sum of positive squares in 2 ways, for example, as 626550961 + 161290000 = 25031^2 + 12700^2 .

It is a cyclic number.

It is not a de Polignac number, because 787840961 - 2¹⁸ = 787578817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (787840967) 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, 1344146 + ... + 1344731.

It is an arithmetic number, because the mean of its divisors is an integer number (197632533).

Almost surely, 2^787840961 is an apocalyptic number.

It is an amenable number.

787840961 is a deficient number, since it is larger than the sum of its proper divisors (2689171).

787840961 is a wasteful number, since it uses less digits than its factorization.

787840961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689170.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 787840961 is about 28068.5047873947. The cubic root of 787840961 is about 923.5906313168.

The spelling of 787840961 in words is "seven hundred eighty-seven million, eight hundred forty thousand, nine hundred sixty-one".