245491687 has 8 divisors (see below), whose sum is σ = 287086976. Its totient is φ = 205527672.

The previous prime is 245491667. The next prime is 245491703. The reversal of 245491687 is 786194542.

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

It is a de Polignac number, because none of the positive numbers 2^k-245491687 is a prime.

It is a super-2 number, since 2×245491687² = 120532336772211938, 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 (245491607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407493 + ... + 408094.

It is an arithmetic number, because the mean of its divisors is an integer number (35885872).

Almost surely, 2^245491687 is an apocalyptic number.

245491687 is a deficient number, since it is larger than the sum of its proper divisors (41595289).

245491687 is an equidigital number, since it uses as much as digits as its factorization.

245491687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815637.

The product of its digits is 483840, while the sum is 46.

The square root of 245491687 is about 15668.1743352568. The cubic root of 245491687 is about 626.1507860459.

The spelling of 245491687 in words is "two hundred forty-five million, four hundred ninety-one thousand, six hundred eighty-seven".