953661 has 4 divisors (see below), whose sum is σ = 1271552. Its totient is φ = 635772.

The previous prime is 953651. The next prime is 953671. The reversal of 953661 is 166359.

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 an interprime number because it is at equal distance from previous prime (953651) and next prime (953671).

It is not a de Polignac number, because 953661 - 2⁹ = 953149 is a prime.

It is a D-number.

It is a Duffinian number.

953661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (953621) 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, 158941 + ... + 158946.

It is an arithmetic number, because the mean of its divisors is an integer number (317888).

2⁹⁵³⁶⁶¹ is an apocalyptic number.

It is an amenable number.

953661 is a deficient number, since it is larger than the sum of its proper divisors (317891).

953661 is a wasteful number, since it uses less digits than its factorization.

953661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317890.

The product of its digits is 4860, while the sum is 30.

The square root of 953661 is about 976.5556819762. Note that the first 3 decimals coincide. The cubic root of 953661 is about 98.4308738800.

The spelling of 953661 in words is "nine hundred fifty-three thousand, six hundred sixty-one".