617484991 has 4 divisors (see below), whose sum is σ = 617671432. Its totient is φ = 617298552.

The previous prime is 617484983. The next prime is 617485003. The reversal of 617484991 is 199484716.

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

It is a cyclic number.

It is not a de Polignac number, because 617484991 - 2³ = 617484983 is a prime.

It is a super-2 number, since 2×617484991² = 762575428220540162, 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 (617484911) 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, 88161 + ... + 94906.

It is an arithmetic number, because the mean of its divisors is an integer number (154417858).

Almost surely, 2^617484991 is an apocalyptic number.

617484991 is a deficient number, since it is larger than the sum of its proper divisors (186441).

617484991 is a wasteful number, since it uses less digits than its factorization.

617484991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186440.

The product of its digits is 435456, while the sum is 49.

The square root of 617484991 is about 24849.2452802897. The cubic root of 617484991 is about 851.5473503335.

The spelling of 617484991 in words is "six hundred seventeen million, four hundred eighty-four thousand, nine hundred ninety-one".