521094137 has 6 divisors (see below), whose sum is σ = 522507258. Its totient is φ = 519683472.

The previous prime is 521094121. The next prime is 521094143. The reversal of 521094137 is 731490125.

It can be written as a sum of positive squares in only one way, i.e., 304886521 + 216207616 = 17461^2 + 14704^2 .

It is not a de Polignac number, because 521094137 - 2⁴ = 521094121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521094107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 566564 + ... + 567482.

It is an arithmetic number, because the mean of its divisors is an integer number (87084543).

Almost surely, 2^521094137 is an apocalyptic number.

It is an amenable number.

521094137 is a deficient number, since it is larger than the sum of its proper divisors (1413121).

521094137 is an frugal number, since it uses more digits than its factorization.

521094137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2455 (or 1536 counting only the distinct ones).

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

The square root of 521094137 is about 22827.4864363118. The cubic root of 521094137 is about 804.7087597867.

The spelling of 521094137 in words is "five hundred twenty-one million, ninety-four thousand, one hundred thirty-seven".