495721381 has 4 divisors (see below), whose sum is σ = 521812000. Its totient is φ = 469630764.

The previous prime is 495721379. The next prime is 495721393. The reversal of 495721381 is 183127594.

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 495721381 - 2¹ = 495721379 is a prime.

It is a super-2 number, since 2×495721381² = 491479375161094322, 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 (495721351) 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, 13045281 + ... + 13045318.

It is an arithmetic number, because the mean of its divisors is an integer number (130453000).

Almost surely, 2^495721381 is an apocalyptic number.

It is an amenable number.

495721381 is a deficient number, since it is larger than the sum of its proper divisors (26090619).

495721381 is a wasteful number, since it uses less digits than its factorization.

495721381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26090618.

The product of its digits is 60480, while the sum is 40.

The square root of 495721381 is about 22264.8013914340. The cubic root of 495721381 is about 791.4300759214.

The spelling of 495721381 in words is "four hundred ninety-five million, seven hundred twenty-one thousand, three hundred eighty-one".