391031049 has 16 divisors (see below), whose sum is σ = 526417920. Its totient is φ = 258178320.

The previous prime is 391031029. The next prime is 391031051. The reversal of 391031049 is 940130193.

It is not a de Polignac number, because 391031049 - 2¹⁵ = 390998281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391031029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144184 + ... + 146870.

It is an arithmetic number, because the mean of its divisors is an integer number (32901120).

Almost surely, 2^391031049 is an apocalyptic number.

It is an amenable number.

391031049 is a deficient number, since it is larger than the sum of its proper divisors (135386871).

391031049 is a wasteful number, since it uses less digits than its factorization.

391031049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 391031049 is about 19774.5050254109. The cubic root of 391031049 is about 731.2576363291.

The spelling of 391031049 in words is "three hundred ninety-one million, thirty-one thousand, forty-nine".