687242149 has 8 divisors (see below), whose sum is σ = 763864992. Its totient is φ = 612977040.

The previous prime is 687242099. The next prime is 687242159. The reversal of 687242149 is 941242786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687242149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687242159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588819 + ... + 589984.

It is an arithmetic number, because the mean of its divisors is an integer number (95483124).

Almost surely, 2^687242149 is an apocalyptic number.

It is an amenable number.

687242149 is a deficient number, since it is larger than the sum of its proper divisors (76622843).

687242149 is a wasteful number, since it uses less digits than its factorization.

687242149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178867.

The product of its digits is 193536, while the sum is 43.

The square root of 687242149 is about 26215.3037174853. The cubic root of 687242149 is about 882.4767301737.

The spelling of 687242149 in words is "six hundred eighty-seven million, two hundred forty-two thousand, one hundred forty-nine".