787121 has 4 divisors (see below), whose sum is σ = 812544. Its totient is φ = 761700.

The previous prime is 787099. The next prime is 787123. The reversal of 787121 is 121787.

787121 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 787121 - 2⁶ = 787057 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (787123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12665 + ... + 12726.

It is an arithmetic number, because the mean of its divisors is an integer number (203136).

2⁷⁸⁷¹²¹ is an apocalyptic number.

It is an amenable number.

787121 is a deficient number, since it is larger than the sum of its proper divisors (25423).

787121 is a wasteful number, since it uses less digits than its factorization.

787121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25422.

The product of its digits is 784, while the sum is 26.

The square root of 787121 is about 887.1983994575. The cubic root of 787121 is about 92.3309207390.

The spelling of 787121 in words is "seven hundred eighty-seven thousand, one hundred twenty-one".