1945261 has 2 divisors, whose sum is σ = 1945262. Its totient is φ = 1945260.

The previous prime is 1945243. The next prime is 1945297. The reversal of 1945261 is 1625491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1943236 + 2025 = 1394^2 + 45^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945261 is a prime.

1945261 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972630 + 972631.

It is an arithmetic number, because the mean of its divisors is an integer number (972631).

2^1945261 is an apocalyptic number.

It is an amenable number.

1945261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945261 is an equidigital number, since it uses as much as digits as its factorization.

1945261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 1945261 is about 1394.7261379927. The cubic root of 1945261 is about 124.8320090000.

The spelling of 1945261 in words is "one million, nine hundred forty-five thousand, two hundred sixty-one".