31250113 has 2 divisors, whose sum is σ = 31250114. Its totient is φ = 31250112.

The previous prime is 31250057. The next prime is 31250129. The reversal of 31250113 is 31105213.

It is an a-pointer prime, because the next prime (31250129) can be obtained adding 31250113 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26286129 + 4963984 = 5127^2 + 2228^2 .

It is a cyclic number.

It is not a de Polignac number, because 31250113 - 2¹³ = 31241921 is a prime.

It is not a weakly prime, because it can be changed into another prime (31250143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15625056 + 15625057.

It is an arithmetic number, because the mean of its divisors is an integer number (15625057).

Almost surely, 2^31250113 is an apocalyptic number.

It is an amenable number.

31250113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31250113 is an equidigital number, since it uses as much as digits as its factorization.

31250113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 31250113 is about 5590.1800507676. The cubic root of 31250113 is about 314.9806421295.

Adding to 31250113 its reverse (31105213), we get a palindrome (62355326).

The spelling of 31250113 in words is "thirty-one million, two hundred fifty thousand, one hundred thirteen".