391474438522 has 4 divisors (see below), whose sum is σ = 587211657786. Its totient is φ = 195737219260.

The previous prime is 391474438507. The next prime is 391474438529. The reversal of 391474438522 is 225834474193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 225834474193 = 101 ⋅2235984893.

It can be written as a sum of positive squares in only one way, i.e., 268623487521 + 122850951001 = 518289^2 + 350501^2 .

It is a super-2 number, since 2×391474438522² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 391474438522.

It is not an unprimeable number, because it can be changed into a prime (391474438529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97868609629 + ... + 97868609632.

Almost surely, 2^391474438522 is an apocalyptic number.

391474438522 is a deficient number, since it is larger than the sum of its proper divisors (195737219264).

391474438522 is a wasteful number, since it uses less digits than its factorization.

391474438522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195737219263.

The product of its digits is 5806080, while the sum is 52.

The spelling of 391474438522 in words is "three hundred ninety-one billion, four hundred seventy-four million, four hundred thirty-eight thousand, five hundred twenty-two".