391263074474 has 4 divisors (see below), whose sum is σ = 586894611714. Its totient is φ = 195631537236.

The previous prime is 391263074459. The next prime is 391263074513. The reversal of 391263074474 is 474470362193.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 474470362193 = 331 ⋅1433445203.

It can be written as a sum of positive squares in only one way, i.e., 291106648849 + 100156425625 = 539543^2 + 316475^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97815768617 + ... + 97815768620.

Almost surely, 2^391263074474 is an apocalyptic number.

391263074474 is a deficient number, since it is larger than the sum of its proper divisors (195631537240).

391263074474 is a wasteful number, since it uses less digits than its factorization.

391263074474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195631537239.

The product of its (nonzero) digits is 3048192, while the sum is 50.

The spelling of 391263074474 in words is "three hundred ninety-one billion, two hundred sixty-three million, seventy-four thousand, four hundred seventy-four".