251420413 has 4 divisors (see below), whose sum is σ = 252239680. Its totient is φ = 250601148.

The previous prime is 251420387. The next prime is 251420419. The reversal of 251420413 is 314024152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251420413 - 2⁹ = 251419901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251420419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409173 + ... + 409786.

It is an arithmetic number, because the mean of its divisors is an integer number (63059920).

Almost surely, 2^251420413 is an apocalyptic number.

It is an amenable number.

251420413 is a deficient number, since it is larger than the sum of its proper divisors (819267).

251420413 is an equidigital number, since it uses as much as digits as its factorization.

251420413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 819266.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 251420413 is about 15856.2420831671. The cubic root of 251420413 is about 631.1513446713.

Adding to 251420413 its reverse (314024152), we get a palindrome (565444565).

The spelling of 251420413 in words is "two hundred fifty-one million, four hundred twenty thousand, four hundred thirteen".