251402061 has 8 divisors (see below), whose sum is σ = 338169600. Its totient is φ = 166117952.

The previous prime is 251402027. The next prime is 251402077. The reversal of 251402061 is 160204152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 251402061 - 2¹³ = 251393869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251402461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370461 + ... + 371138.

It is an arithmetic number, because the mean of its divisors is an integer number (42271200).

Almost surely, 2^251402061 is an apocalyptic number.

It is an amenable number.

251402061 is a deficient number, since it is larger than the sum of its proper divisors (86767539).

251402061 is a wasteful number, since it uses less digits than its factorization.

251402061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741715.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 251402061 is about 15855.6633730664. The cubic root of 251402061 is about 631.1359876958.

The spelling of 251402061 in words is "two hundred fifty-one million, four hundred two thousand, sixty-one".