1261601 has 4 divisors (see below), whose sum is σ = 1376304. Its totient is φ = 1146900.

The previous prime is 1261571. The next prime is 1261627. The reversal of 1261601 is 1061621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1261601 - 2¹⁰ = 1260577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1261601.

It is not an unprimeable number, because it can be changed into a prime (1261301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57335 + ... + 57356.

It is an arithmetic number, because the mean of its divisors is an integer number (344076).

2^1261601 is an apocalyptic number.

1261601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1261601 is a deficient number, since it is larger than the sum of its proper divisors (114703).

1261601 is a wasteful number, since it uses less digits than its factorization.

1261601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114702.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1261601 is about 1123.2101317207. The cubic root of 1261601 is about 108.0539568064.

The spelling of 1261601 in words is "one million, two hundred sixty-one thousand, six hundred one".