252021551 has 2 divisors, whose sum is σ = 252021552. Its totient is φ = 252021550.

The previous prime is 252021521. The next prime is 252021569. The reversal of 252021551 is 155120252.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 252021551 - 2¹⁴ = 252005167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252021521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126010775 + 126010776.

It is an arithmetic number, because the mean of its divisors is an integer number (126010776).

Almost surely, 2^252021551 is an apocalyptic number.

252021551 is a deficient number, since it is larger than the sum of its proper divisors (1).

252021551 is an equidigital number, since it uses as much as digits as its factorization.

252021551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 252021551 is about 15875.1866445721. The cubic root of 252021551 is about 631.6539650547.

The spelling of 252021551 in words is "two hundred fifty-two million, twenty-one thousand, five hundred fifty-one".