951661 has 4 divisors (see below), whose sum is σ = 967324. Its totient is φ = 936000.

The previous prime is 951659. The next prime is 951689. The reversal of 951661 is 166159.

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 447561 + 504100 = 669^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 951661 - 2¹ = 951659 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 (951641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7740 + ... + 7861.

It is an arithmetic number, because the mean of its divisors is an integer number (241831).

2⁹⁵¹⁶⁶¹ is an apocalyptic number.

It is an amenable number.

951661 is a deficient number, since it is larger than the sum of its proper divisors (15663).

951661 is a wasteful number, since it uses less digits than its factorization.

951661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15662.

The product of its digits is 1620, while the sum is 28.

The square root of 951661 is about 975.5311373811. The cubic root of 951661 is about 98.3620165933.

The spelling of 951661 in words is "nine hundred fifty-one thousand, six hundred sixty-one".