1530891949 has 4 divisors (see below), whose sum is σ = 1530971164. Its totient is φ = 1530812736.

The previous prime is 1530891913. The next prime is 1530892001. The reversal of 1530891949 is 9491980351.

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 2 ways, for example, as 418202500 + 1112689449 = 20450^2 + 33357^2 .

It is a cyclic number.

It is not a de Polignac number, because 1530891949 - 2⁹ = 1530891437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530891749) 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, 10579 + ... + 56335.

It is an arithmetic number, because the mean of its divisors is an integer number (382742791).

Almost surely, 2^1530891949 is an apocalyptic number.

It is an amenable number.

1530891949 is a deficient number, since it is larger than the sum of its proper divisors (79215).

1530891949 is an equidigital number, since it uses as much as digits as its factorization.

1530891949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79214.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 1530891949 is about 39126.6143309129. The cubic root of 1530891949 is about 1152.5192281162.

The spelling of 1530891949 in words is "one billion, five hundred thirty million, eight hundred ninety-one thousand, nine hundred forty-nine".