1961281 has 4 divisors (see below), whose sum is σ = 2241472. Its totient is φ = 1681092.

The previous prime is 1961257. The next prime is 1961321. The reversal of 1961281 is 1821691.

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 not a de Polignac number, because 1961281 - 2⁵ = 1961249 is a prime.

It is a super-2 number, since 2×1961281² = 7693246321922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961221) 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, 140085 + ... + 140098.

It is an arithmetic number, because the mean of its divisors is an integer number (560368).

2^1961281 is an apocalyptic number.

It is an amenable number.

1961281 is a deficient number, since it is larger than the sum of its proper divisors (280191).

1961281 is an equidigital number, since it uses as much as digits as its factorization.

1961281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280190.

The product of its digits is 864, while the sum is 28.

The square root of 1961281 is about 1400.4574252722. The cubic root of 1961281 is about 125.1737530338.

The spelling of 1961281 in words is "one million, nine hundred sixty-one thousand, two hundred eighty-one".