31420191 has 24 divisors (see below), whose sum is σ = 46558512. Its totient is φ = 18832000.

The previous prime is 31420189. The next prime is 31420217. The reversal of 31420191 is 19102413.

It is not a de Polignac number, because 31420191 - 2¹ = 31420189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31422191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36235 + ... + 37091.

It is an arithmetic number, because the mean of its divisors is an integer number (1939938).

Almost surely, 2^31420191 is an apocalyptic number.

31420191 is a deficient number, since it is larger than the sum of its proper divisors (15138321).

31420191 is a wasteful number, since it uses less digits than its factorization.

31420191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 31420191 is about 5605.3716201515. The cubic root of 31420191 is about 315.5510334924.

The spelling of 31420191 in words is "thirty-one million, four hundred twenty thousand, one hundred ninety-one".