495981551 has 8 divisors (see below), whose sum is σ = 547162224. Its totient is φ = 446662080.

The previous prime is 495981547. The next prime is 495981571. The reversal of 495981551 is 155189594.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 495981551 - 2² = 495981547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 495981496 and 495981505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (495981571) 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, 464741 + ... + 465806.

It is an arithmetic number, because the mean of its divisors is an integer number (68395278).

Almost surely, 2^495981551 is an apocalyptic number.

495981551 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

495981551 is a deficient number, since it is larger than the sum of its proper divisors (51180673).

495981551 is a wasteful number, since it uses less digits than its factorization.

495981551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930601.

The product of its digits is 324000, while the sum is 47.

The square root of 495981551 is about 22270.6432551914. The cubic root of 495981551 is about 791.5685074135.

The spelling of 495981551 in words is "four hundred ninety-five million, nine hundred eighty-one thousand, five hundred fifty-one".