245151421 has 4 divisors (see below), whose sum is σ = 245450844. Its totient is φ = 244852000.

The previous prime is 245151397. The next prime is 245151437. The reversal of 245151421 is 124151542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 119464900 + 125686521 = 10930^2 + 11211^2 .

It is a cyclic number.

It is not a de Polignac number, because 245151421 - 2⁹ = 245150909 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 (245151121) 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, 148480 + ... + 150121.

It is an arithmetic number, because the mean of its divisors is an integer number (61362711).

Almost surely, 2^245151421 is an apocalyptic number.

It is an amenable number.

245151421 is a deficient number, since it is larger than the sum of its proper divisors (299423).

245151421 is an equidigital number, since it uses as much as digits as its factorization.

245151421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299422.

The product of its digits is 1600, while the sum is 25.

The square root of 245151421 is about 15657.3120617812. The cubic root of 245151421 is about 625.8613582737.

The spelling of 245151421 in words is "two hundred forty-five million, one hundred fifty-one thousand, four hundred twenty-one".