391150121 has 16 divisors (see below), whose sum is σ = 418258944. Its totient is φ = 364939344.

The previous prime is 391150079. The next prime is 391150129. The reversal of 391150121 is 121051193.

It is not a de Polignac number, because 391150121 - 2¹⁴ = 391133737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391150129) 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, 526076 + ... + 526818.

It is an arithmetic number, because the mean of its divisors is an integer number (26141184).

Almost surely, 2^391150121 is an apocalyptic number.

It is an amenable number.

391150121 is a deficient number, since it is larger than the sum of its proper divisors (27108823).

391150121 is a wasteful number, since it uses less digits than its factorization.

391150121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 391150121 is about 19777.5155416448. The cubic root of 391150121 is about 731.3318533449.

The spelling of 391150121 in words is "three hundred ninety-one million, one hundred fifty thousand, one hundred twenty-one".