691200049 has 4 divisors (see below), whose sum is σ = 693642736. Its totient is φ = 688757364.

The previous prime is 691200043. The next prime is 691200061. The reversal of 691200049 is 940002196.

It is a happy number.

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 691200049 - 2⁷ = 691199921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (691200043) 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, 1220919 + ... + 1221484.

It is an arithmetic number, because the mean of its divisors is an integer number (173410684).

Almost surely, 2^691200049 is an apocalyptic number.

It is an amenable number.

691200049 is a deficient number, since it is larger than the sum of its proper divisors (2442687).

691200049 is a wasteful number, since it uses less digits than its factorization.

691200049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442686.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 691200049 is about 26290.6836921370. The cubic root of 691200049 is about 884.1675805669.

The spelling of 691200049 in words is "six hundred ninety-one million, two hundred thousand, forty-nine".