245421309 has 32 divisors (see below), whose sum is σ = 395822080. Its totient is φ = 132129792.

The previous prime is 245421307. The next prime is 245421311. The reversal of 245421309 is 903124542.

It is an interprime number because it is at equal distance from previous prime (245421307) and next prime (245421311).

It is not a de Polignac number, because 245421309 - 2¹ = 245421307 is a prime.

It is a super-2 number, since 2×245421309² = 120463237822546962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245421307) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75414 + ... + 78600.

It is an arithmetic number, because the mean of its divisors is an integer number (12369440).

Almost surely, 2^245421309 is an apocalyptic number.

It is an amenable number.

245421309 is a deficient number, since it is larger than the sum of its proper divisors (150400771).

245421309 is a wasteful number, since it uses less digits than its factorization.

245421309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3409.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 245421309 is about 15665.9282840182. The cubic root of 245421309 is about 626.0909449812.

The spelling of 245421309 in words is "two hundred forty-five million, four hundred twenty-one thousand, three hundred nine".