1261901 has 2 divisors, whose sum is σ = 1261902. Its totient is φ = 1261900.

The previous prime is 1261891. The next prime is 1261913. The reversal of 1261901 is 1091621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1155625 + 106276 = 1075^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 1261901 - 2⁶ = 1261837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630950 + 630951.

It is an arithmetic number, because the mean of its divisors is an integer number (630951).

2^1261901 is an apocalyptic number.

It is an amenable number.

1261901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261901 is an equidigital number, since it uses as much as digits as its factorization.

1261901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1261901 is about 1123.3436695865. The cubic root of 1261901 is about 108.0625209557.

The spelling of 1261901 in words is "one million, two hundred sixty-one thousand, nine hundred one".