1361921 has 8 divisors (see below), whose sum is σ = 1573344. Its totient is φ = 1165120.

The previous prime is 1361911. The next prime is 1361929. The reversal of 1361921 is 1291631.

1361921 = 275² + 276² + ... + 291².

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1361921 - 2¹⁴ = 1345537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1361929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3455 + ... + 3828.

It is an arithmetic number, because the mean of its divisors is an integer number (196668).

It is a Proth number, since it is equal to 665 ⋅ 2¹¹ + 1 and 665 < 2¹¹.

2^1361921 is an apocalyptic number.

1361921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1361921 is a deficient number, since it is larger than the sum of its proper divisors (211423).

1361921 is a wasteful number, since it uses less digits than its factorization.

1361921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7311.

The product of its digits is 324, while the sum is 23.

The square root of 1361921 is about 1167.0137102879. The cubic root of 1361921 is about 110.8453057085.

The spelling of 1361921 in words is "one million, three hundred sixty-one thousand, nine hundred twenty-one".