125421511 has 2 divisors, whose sum is σ = 125421512. Its totient is φ = 125421510.

The previous prime is 125421469. The next prime is 125421523. The reversal of 125421511 is 115124521.

It is a strong prime.

It is an emirp because it is prime and its reverse (115124521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125421511 - 2¹⁵ = 125388743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125421011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62710755 + 62710756.

It is an arithmetic number, because the mean of its divisors is an integer number (62710756).

Almost surely, 2^125421511 is an apocalyptic number.

125421511 is a deficient number, since it is larger than the sum of its proper divisors (1).

125421511 is an equidigital number, since it uses as much as digits as its factorization.

125421511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 400, while the sum is 22.

The square root of 125421511 is about 11199.1745677974. The cubic root of 125421511 is about 500.5613841265.

The spelling of 125421511 in words is "one hundred twenty-five million, four hundred twenty-one thousand, five hundred eleven".