690655091 has 8 divisors (see below), whose sum is σ = 791384064. Its totient is φ = 590442120.

The previous prime is 690655057. The next prime is 690655099. The reversal of 690655091 is 190556096.

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

It is a cyclic number.

It is not a de Polignac number, because 690655091 - 2⁶ = 690655027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690655099) 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, 126125 + ... + 131486.

It is an arithmetic number, because the mean of its divisors is an integer number (98923008).

Almost surely, 2^690655091 is an apocalyptic number.

690655091 is a deficient number, since it is larger than the sum of its proper divisors (100728973).

690655091 is a wasteful number, since it uses less digits than its factorization.

690655091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258001.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 690655091 is about 26280.3175589642. The cubic root of 690655091 is about 883.9351534607.

The spelling of 690655091 in words is "six hundred ninety million, six hundred fifty-five thousand, ninety-one".