125402440213 has 2 divisors, whose sum is σ = 125402440214. Its totient is φ = 125402440212.

The previous prime is 125402440201. The next prime is 125402440243. The reversal of 125402440213 is 312044204521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95346323524 + 30056116689 = 308782^2 + 173367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125402440213 is a prime.

It is a super-2 number, since 2×125402440213² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125402440243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62701220106 + 62701220107.

It is an arithmetic number, because the mean of its divisors is an integer number (62701220107).

Almost surely, 2^125402440213 is an apocalyptic number.

It is an amenable number.

125402440213 is a deficient number, since it is larger than the sum of its proper divisors (1).

125402440213 is an equidigital number, since it uses as much as digits as its factorization.

125402440213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 125402440213 its reverse (312044204521), we get a palindrome (437446644734).

The spelling of 125402440213 in words is "one hundred twenty-five billion, four hundred two million, four hundred forty thousand, two hundred thirteen".