31949140191 has 16 divisors (see below), whose sum is σ = 42975744000. Its totient is φ = 21111306048.

The previous prime is 31949140189. The next prime is 31949140193. The reversal of 31949140191 is 19104194913.

It is an interprime number because it is at equal distance from previous prime (31949140189) and next prime (31949140193).

It is not a de Polignac number, because 31949140191 - 2¹ = 31949140189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31949140193) 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, 359700 + ... + 439638.

It is an arithmetic number, because the mean of its divisors is an integer number (2685984000).

Almost surely, 2^31949140191 is an apocalyptic number.

31949140191 is a deficient number, since it is larger than the sum of its proper divisors (11026603809).

31949140191 is a wasteful number, since it uses less digits than its factorization.

31949140191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81118.

The product of its (nonzero) digits is 34992, while the sum is 42.

The spelling of 31949140191 in words is "thirty-one billion, nine hundred forty-nine million, one hundred forty thousand, one hundred ninety-one".