1961533 has 4 divisors (see below), whose sum is σ = 2241760. Its totient is φ = 1681308.

The previous prime is 1961527. The next prime is 1961537. The reversal of 1961533 is 3351691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3351691 = 7 ⋅478813.

It is a cyclic number.

It is not a de Polignac number, because 1961533 - 2⁵ = 1961501 is a prime.

It is a super-2 number, since 2×1961533² = 7695223420178, 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 (1961537) 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, 140103 + ... + 140116.

It is an arithmetic number, because the mean of its divisors is an integer number (560440).

2^1961533 is an apocalyptic number.

It is an amenable number.

1961533 is a deficient number, since it is larger than the sum of its proper divisors (280227).

1961533 is an equidigital number, since it uses as much as digits as its factorization.

1961533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280226.

The product of its digits is 2430, while the sum is 28.

The square root of 1961533 is about 1400.5473929860. The cubic root of 1961533 is about 125.1791138898.

The spelling of 1961533 in words is "one million, nine hundred sixty-one thousand, five hundred thirty-three".