31401479 has 2 divisors, whose sum is σ = 31401480. Its totient is φ = 31401478.

The previous prime is 31401467. The next prime is 31401497. The reversal of 31401479 is 97410413.

Together with next prime (31401497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (97410413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31401479 - 2²⁴ = 14624263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31401439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15700739 + 15700740.

It is an arithmetic number, because the mean of its divisors is an integer number (15700740).

Almost surely, 2^31401479 is an apocalyptic number.

31401479 is a deficient number, since it is larger than the sum of its proper divisors (1).

31401479 is an equidigital number, since it uses as much as digits as its factorization.

31401479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 31401479 is about 5603.7022583289. The cubic root of 31401479 is about 315.4883799006.

The spelling of 31401479 in words is "thirty-one million, four hundred one thousand, four hundred seventy-nine".