1881157 has 2 divisors, whose sum is σ = 1881158. Its totient is φ = 1881156.

The previous prime is 1881151. The next prime is 1881161. The reversal of 1881157 is 7511881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1437601 + 443556 = 1199^2 + 666^2 .

It is a cyclic number.

It is not a de Polignac number, because 1881157 - 2¹¹ = 1879109 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1881151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940578 + 940579.

It is an arithmetic number, because the mean of its divisors is an integer number (940579).

2^1881157 is an apocalyptic number.

It is an amenable number.

1881157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881157 is an equidigital number, since it uses as much as digits as its factorization.

1881157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 31.

The square root of 1881157 is about 1371.5527696738. The cubic root of 1881157 is about 123.4454292935.

The spelling of 1881157 in words is "one million, eight hundred eighty-one thousand, one hundred fifty-seven".