125616551 has 2 divisors, whose sum is σ = 125616552. Its totient is φ = 125616550.

The previous prime is 125616539. The next prime is 125616583. The reversal of 125616551 is 155616521.

It is an a-pointer prime, because the next prime (125616583) can be obtained adding 125616551 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 125616551 - 2¹⁸ = 125354407 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 (125616521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62808275 + 62808276.

It is an arithmetic number, because the mean of its divisors is an integer number (62808276).

Almost surely, 2^125616551 is an apocalyptic number.

125616551 is a deficient number, since it is larger than the sum of its proper divisors (1).

125616551 is an equidigital number, since it uses as much as digits as its factorization.

125616551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 32.

The square root of 125616551 is about 11207.8789697248. The cubic root of 125616551 is about 500.8207200999.

The spelling of 125616551 in words is "one hundred twenty-five million, six hundred sixteen thousand, five hundred fifty-one".