25131013109 has 2 divisors, whose sum is σ = 25131013110. Its totient is φ = 25131013108.

The previous prime is 25131013097. The next prime is 25131013121. The reversal of 25131013109 is 90131013152.

It is a balanced prime because it is at equal distance from previous prime (25131013097) and next prime (25131013121).

It can be written as a sum of positive squares in only one way, i.e., 21622820209 + 3508192900 = 147047^2 + 59230^2 .

It is a cyclic number.

It is not a de Polignac number, because 25131013109 - 2¹⁶ = 25130947573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25131013199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565506554 + 12565506555.

It is an arithmetic number, because the mean of its divisors is an integer number (12565506555).

Almost surely, 2^25131013109 is an apocalyptic number.

It is an amenable number.

25131013109 is a deficient number, since it is larger than the sum of its proper divisors (1).

25131013109 is an equidigital number, since it uses as much as digits as its factorization.

25131013109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The spelling of 25131013109 in words is "twenty-five billion, one hundred thirty-one million, thirteen thousand, one hundred nine".