31491079 has 2 divisors, whose sum is σ = 31491080. Its totient is φ = 31491078.

The previous prime is 31491077. The next prime is 31491101. The reversal of 31491079 is 97019413.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31491079 - 2¹ = 31491077 is a prime.

Together with 31491077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31491077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15745539 + 15745540.

It is an arithmetic number, because the mean of its divisors is an integer number (15745540).

Almost surely, 2^31491079 is an apocalyptic number.

31491079 is a deficient number, since it is larger than the sum of its proper divisors (1).

31491079 is an equidigital number, since it uses as much as digits as its factorization.

31491079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 31491079 is about 5611.6912780373. The cubic root of 31491079 is about 315.7881631822.

The spelling of 31491079 in words is "thirty-one million, four hundred ninety-one thousand, seventy-nine".