1951601 has 2 divisors, whose sum is σ = 1951602. Its totient is φ = 1951600.

The previous prime is 1951597. The next prime is 1951603. The reversal of 1951601 is 1061591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 274576 = 1295^2 + 524^2 .

It is an emirp because it is prime and its reverse (1061591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1951601 - 2² = 1951597 is a prime.

It is a Sophie Germain prime.

Together with 1951603, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1951603) 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, 975800 + 975801.

It is an arithmetic number, because the mean of its divisors is an integer number (975801).

2^1951601 is an apocalyptic number.

It is an amenable number.

1951601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951601 is an equidigital number, since it uses as much as digits as its factorization.

1951601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1951601 is about 1396.9971367186. The cubic root of 1951601 is about 124.9674795401.

It can be divided in two parts, 1951 and 601, that added together give a palindrome (2552).

The spelling of 1951601 in words is "one million, nine hundred fifty-one thousand, six hundred one".