787561549 has 4 divisors (see below), whose sum is σ = 790344736. Its totient is φ = 784778364.

The previous prime is 787561543. The next prime is 787561633. The reversal of 787561549 is 945165787.

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 787561549 - 2⁵ = 787561517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 787561496 and 787561505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787561543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391169 + ... + 1391734.

It is an arithmetic number, because the mean of its divisors is an integer number (197586184).

Almost surely, 2^787561549 is an apocalyptic number.

It is an amenable number.

787561549 is a deficient number, since it is larger than the sum of its proper divisors (2783187).

787561549 is a wasteful number, since it uses less digits than its factorization.

787561549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2783186.

The product of its digits is 2116800, while the sum is 52.

The square root of 787561549 is about 28063.5270235229. The cubic root of 787561549 is about 923.4814329582.

The spelling of 787561549 in words is "seven hundred eighty-seven million, five hundred sixty-one thousand, five hundred forty-nine".