125622781 has 2 divisors, whose sum is σ = 125622782. Its totient is φ = 125622780.

The previous prime is 125622769. The next prime is 125622787. The reversal of 125622781 is 187226521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125552025 + 70756 = 11205^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 125622781 - 2¹³ = 125614589 is a prime.

It is a super-2 number, since 2×125622781² = 31562166212347922, which contains 22 as substring.

It is equal to p_7143496 and since 125622781 and 7143496 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125622787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62811390 + 62811391.

It is an arithmetic number, because the mean of its divisors is an integer number (62811391).

Almost surely, 2^125622781 is an apocalyptic number.

It is an amenable number.

125622781 is a deficient number, since it is larger than the sum of its proper divisors (1).

125622781 is an equidigital number, since it uses as much as digits as its factorization.

125622781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 34.

The square root of 125622781 is about 11208.1568957612. The cubic root of 125622781 is about 500.8289994269.

The spelling of 125622781 in words is "one hundred twenty-five million, six hundred twenty-two thousand, seven hundred eighty-one".