690961 has 4 divisors (see below), whose sum is σ = 704052. Its totient is φ = 677872.

The previous prime is 690953. The next prime is 690997. The reversal of 690961 is 169096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 483025 + 207936 = 695^2 + 456^2 .

It is a cyclic number.

It is not a de Polignac number, because 690961 - 2³ = 690953 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690661) 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, 6466 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (176013).

2⁶⁹⁰⁹⁶¹ is an apocalyptic number.

It is an amenable number.

690961 is a deficient number, since it is larger than the sum of its proper divisors (13091).

690961 is a wasteful number, since it uses less digits than its factorization.

690961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13090.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 690961 is about 831.2406390450. The cubic root of 690961 is about 88.4065640110.

The spelling of 690961 in words is "six hundred ninety thousand, nine hundred sixty-one".