521994147 has 8 divisors (see below), whose sum is σ = 697810944. Its totient is φ = 347086728.

The previous prime is 521994127. The next prime is 521994149. The reversal of 521994147 is 741499125.

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

It is not a de Polignac number, because 521994147 - 2¹⁴ = 521977763 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521994099 and 521994108.

It is not an unprimeable number, because it can be changed into a prime (521994149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226003 + ... + 228300.

It is an arithmetic number, because the mean of its divisors is an integer number (87226368).

Almost surely, 2^521994147 is an apocalyptic number.

521994147 is a deficient number, since it is larger than the sum of its proper divisors (175816797).

521994147 is a wasteful number, since it uses less digits than its factorization.

521994147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454689.

The product of its digits is 90720, while the sum is 42.

The square root of 521994147 is about 22847.1912278074. The cubic root of 521994147 is about 805.1717787294.

The spelling of 521994147 in words is "five hundred twenty-one million, nine hundred ninety-four thousand, one hundred forty-seven".