31493121 has 16 divisors (see below), whose sum is σ = 45969600. Its totient is φ = 19019520.

The previous prime is 31493083. The next prime is 31493131. The reversal of 31493121 is 12139413.

It is not a de Polignac number, because 31493121 - 2⁶ = 31493057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31493091 and 31493100.

It is not an unprimeable number, because it can be changed into a prime (31493131) 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, 8805 + ... + 11853.

It is an arithmetic number, because the mean of its divisors is an integer number (2873100).

Almost surely, 2^31493121 is an apocalyptic number.

It is an amenable number.

31493121 is a deficient number, since it is larger than the sum of its proper divisors (14476479).

31493121 is a wasteful number, since it uses less digits than its factorization.

31493121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376.

The product of its digits is 648, while the sum is 24.

The square root of 31493121 is about 5611.8732166720. The cubic root of 31493121 is about 315.7949886654.

The spelling of 31493121 in words is "thirty-one million, four hundred ninety-three thousand, one hundred twenty-one".