251672501 has 2 divisors, whose sum is σ = 251672502. Its totient is φ = 251672500.

The previous prime is 251672459. The next prime is 251672503. The reversal of 251672501 is 105276152.

251672501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185640625 + 66031876 = 13625^2 + 8126^2 .

It is a cyclic number.

It is not a de Polignac number, because 251672501 - 2¹⁰ = 251671477 is a prime.

Together with 251672503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251672503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125836250 + 125836251.

It is an arithmetic number, because the mean of its divisors is an integer number (125836251).

Almost surely, 2^251672501 is an apocalyptic number.

It is an amenable number.

251672501 is a deficient number, since it is larger than the sum of its proper divisors (1).

251672501 is an equidigital number, since it uses as much as digits as its factorization.

251672501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 251672501 is about 15864.1892638735. The cubic root of 251672501 is about 631.3622166152.

The spelling of 251672501 in words is "two hundred fifty-one million, six hundred seventy-two thousand, five hundred one".