1581130 has 8 divisors (see below), whose sum is σ = 2846052. Its totient is φ = 632448.

The previous prime is 1581113. The next prime is 1581131. The reversal of 1581130 is 311851.

It can be written as a sum of positive squares in 2 ways, for example, as 1565001 + 16129 = 1251^2 + 127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1581098 and 1581107.

It is not an unprimeable number, because it can be changed into a prime (1581131) 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, 79047 + ... + 79066.

2^1581130 is an apocalyptic number.

1581130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1581130 is a deficient number, since it is larger than the sum of its proper divisors (1264922).

1581130 is a wasteful number, since it uses less digits than its factorization.

1581130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158120.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1581130 is about 1257.4299185243. The cubic root of 1581130 is about 116.4990882059.

Adding to 1581130 its reverse (311851), we get a palindrome (1892981).

It can be divided in two parts, 1581 and 130, that added together give a triangular number (1711 = T₅₈).

The spelling of 1581130 in words is "one million, five hundred eighty-one thousand, one hundred thirty".