625121551 has 2 divisors, whose sum is σ = 625121552. Its totient is φ = 625121550.

The previous prime is 625121509. The next prime is 625121621. The reversal of 625121551 is 155121526.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 625121551 - 2⁷ = 625121423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (625125551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 312560775 + 312560776.

It is an arithmetic number, because the mean of its divisors is an integer number (312560776).

Almost surely, 2^625121551 is an apocalyptic number.

625121551 is a deficient number, since it is larger than the sum of its proper divisors (1).

625121551 is an equidigital number, since it uses as much as digits as its factorization.

625121551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3000, while the sum is 28.

The square root of 625121551 is about 25002.4309018143. The cubic root of 625121551 is about 855.0433962219.

The spelling of 625121551 in words is "six hundred twenty-five million, one hundred twenty-one thousand, five hundred fifty-one".