251772061 has 2 divisors, whose sum is σ = 251772062. Its totient is φ = 251772060.

The previous prime is 251772047. The next prime is 251772077. The reversal of 251772061 is 160277152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145805625 + 105966436 = 12075^2 + 10294^2 .

It is a cyclic number.

It is not a de Polignac number, because 251772061 - 2⁵ = 251772029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251772361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125886030 + 125886031.

It is an arithmetic number, because the mean of its divisors is an integer number (125886031).

Almost surely, 2^251772061 is an apocalyptic number.

It is an amenable number.

251772061 is a deficient number, since it is larger than the sum of its proper divisors (1).

251772061 is an equidigital number, since it uses as much as digits as its factorization.

251772061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 251772061 is about 15867.3268385069. The cubic root of 251772061 is about 631.4454598978.

The spelling of 251772061 in words is "two hundred fifty-one million, seven hundred seventy-two thousand, sixty-one".