1907161 has 3 divisors (see below), whose sum is σ = 1908543. Its totient is φ = 1905780.

The previous prime is 1907153. The next prime is 1907189. The reversal of 1907161 is 1617091.

The square root of 1907161 is 1381.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 866761 + 1040400 = 931^2 + 1020^2 .

It is not a de Polignac number, because 1907161 - 2³ = 1907153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1907141) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 691 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (636181).

2^1907161 is an apocalyptic number.

1907161 is the 1381-st square number.

1907161 is the 691-st centered octagonal number.

It is an amenable number.

1907161 is a deficient number, since it is larger than the sum of its proper divisors (1382).

1907161 is an frugal number, since it uses more digits than its factorization.

1907161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 378, while the sum is 25.

The cubic root of 1907161 is about 124.0116404265.

Multiplying 1907161 by its sum of digits (25), we get a square (47679025 = 6905²).

The spelling of 1907161 in words is "one million, nine hundred seven thousand, one hundred sixty-one".