130745921 has 4 divisors (see below), whose sum is σ = 130786500. Its totient is φ = 130705344.

The previous prime is 130745911. The next prime is 130745933. The reversal of 130745921 is 129547031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129547031 = 29 ⋅4467139.

It can be written as a sum of positive squares in 2 ways, for example, as 15484225 + 115261696 = 3935^2 + 10736^2 .

It is a cyclic number.

It is not a de Polignac number, because 130745921 - 2²² = 126551617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130745911) 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, 14996 + ... + 22053.

It is an arithmetic number, because the mean of its divisors is an integer number (32696625).

Almost surely, 2^130745921 is an apocalyptic number.

It is an amenable number.

130745921 is a deficient number, since it is larger than the sum of its proper divisors (40579).

130745921 is an equidigital number, since it uses as much as digits as its factorization.

130745921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40578.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 130745921 is about 11434.4182624216. The cubic root of 130745921 is about 507.5467481021.

The spelling of 130745921 in words is "one hundred thirty million, seven hundred forty-five thousand, nine hundred twenty-one".