31250121 has 16 divisors (see below), whose sum is σ = 48728064. Its totient is φ = 17441424.

The previous prime is 31250113. The next prime is 31250129. The reversal of 31250121 is 12105213.

It is an interprime number because it is at equal distance from previous prime (31250113) and next prime (31250129).

It is not a de Polignac number, because 31250121 - 2³ = 31250113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31250121.

It is not an unprimeable number, because it can be changed into a prime (31250129) 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, 16401 + ... + 18206.

It is an arithmetic number, because the mean of its divisors is an integer number (3045504).

Almost surely, 2^31250121 is an apocalyptic number.

It is an amenable number.

31250121 is a deficient number, since it is larger than the sum of its proper divisors (17477943).

31250121 is a wasteful number, since it uses less digits than its factorization.

31250121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34660.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 31250121 is about 5590.1807663080. The cubic root of 31250121 is about 314.9806690077.

Adding to 31250121 its reverse (12105213), we get a palindrome (43355334).

The spelling of 31250121 in words is "thirty-one million, two hundred fifty thousand, one hundred twenty-one".