690686461 has 4 divisors (see below), whose sum is σ = 727038400. Its totient is φ = 654334524.

The previous prime is 690686441. The next prime is 690686471. The reversal of 690686461 is 164686096.

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 690686461 - 2⁷ = 690686333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690686401) 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, 18175941 + ... + 18175978.

It is an arithmetic number, because the mean of its divisors is an integer number (181759600).

Almost surely, 2^690686461 is an apocalyptic number.

It is an amenable number.

690686461 is a deficient number, since it is larger than the sum of its proper divisors (36351939).

690686461 is a wasteful number, since it uses less digits than its factorization.

690686461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36351938.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 690686461 is about 26280.9143866799. The cubic root of 690686461 is about 883.9485362265.

The spelling of 690686461 in words is "six hundred ninety million, six hundred eighty-six thousand, four hundred sixty-one".