1961231 has 2 divisors, whose sum is σ = 1961232. Its totient is φ = 1961230.

The previous prime is 1961221. The next prime is 1961249. The reversal of 1961231 is 1321691.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961231 is a prime.

It is a super-2 number, since 2×1961231² = 7692854070722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961197 and 1961206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980615 + 980616.

It is an arithmetic number, because the mean of its divisors is an integer number (980616).

2^1961231 is an apocalyptic number.

1961231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961231 is an equidigital number, since it uses as much as digits as its factorization.

1961231 is an evil number, because the sum of its binary digits is even.

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

The square root of 1961231 is about 1400.4395738482. The cubic root of 1961231 is about 125.1726893173.

The spelling of 1961231 in words is "one million, nine hundred sixty-one thousand, two hundred thirty-one".