31475783123 has 2 divisors, whose sum is σ = 31475783124. Its totient is φ = 31475783122.

The previous prime is 31475783093. The next prime is 31475783179. The reversal of 31475783123 is 32138757413.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31475783123 - 2¹⁴ = 31475766739 is a prime.

It is a super-2 number, since 2×31475783123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31475783623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15737891561 + 15737891562.

It is an arithmetic number, because the mean of its divisors is an integer number (15737891562).

Almost surely, 2^31475783123 is an apocalyptic number.

31475783123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31475783123 is an equidigital number, since it uses as much as digits as its factorization.

31475783123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 44.

The spelling of 31475783123 in words is "thirty-one billion, four hundred seventy-five million, seven hundred eighty-three thousand, one hundred twenty-three".