125551421 has 2 divisors, whose sum is σ = 125551422. Its totient is φ = 125551420.

The previous prime is 125551417. The next prime is 125551483. The reversal of 125551421 is 124155521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102616900 + 22934521 = 10130^2 + 4789^2 .

It is a cyclic number.

It is not a de Polignac number, because 125551421 - 2² = 125551417 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125554421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62775710 + 62775711.

It is an arithmetic number, because the mean of its divisors is an integer number (62775711).

Almost surely, 2^125551421 is an apocalyptic number.

It is an amenable number.

125551421 is a deficient number, since it is larger than the sum of its proper divisors (1).

125551421 is an equidigital number, since it uses as much as digits as its factorization.

125551421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2000, while the sum is 26.

The square root of 125551421 is about 11204.9730477141. The cubic root of 125551421 is about 500.7341495214.

The spelling of 125551421 in words is "one hundred twenty-five million, five hundred fifty-one thousand, four hundred twenty-one".