1950661 has 2 divisors, whose sum is σ = 1950662. Its totient is φ = 1950660.

The previous prime is 1950649. The next prime is 1950667. The reversal of 1950661 is 1660591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705636 + 245025 = 1306^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 1950661 - 2⁵ = 1950629 is a prime.

1950661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1950667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975330 + 975331.

It is an arithmetic number, because the mean of its divisors is an integer number (975331).

2^1950661 is an apocalyptic number.

It is an amenable number.

1950661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1950661 is an equidigital number, since it uses as much as digits as its factorization.

1950661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1950661 is about 1396.6606602894. The cubic root of 1950661 is about 124.9474125462.

The spelling of 1950661 in words is "one million, nine hundred fifty thousand, six hundred sixty-one".