1961251 has 2 divisors, whose sum is σ = 1961252. Its totient is φ = 1961250.

The previous prime is 1961249. The next prime is 1961257. The reversal of 1961251 is 1521691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1961251 - 2¹ = 1961249 is a prime.

Together with 1961249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1961257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980625 + 980626.

It is an arithmetic number, because the mean of its divisors is an integer number (980626).

2^1961251 is an apocalyptic number.

1961251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961251 is an equidigital number, since it uses as much as digits as its factorization.

1961251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 25.

The square root of 1961251 is about 1400.4467144451. The cubic root of 1961251 is about 125.1731148061.

The spelling of 1961251 in words is "one million, nine hundred sixty-one thousand, two hundred fifty-one".