1617621451 has 4 divisors (see below), whose sum is σ = 1712775672. Its totient is φ = 1522467232.

The previous prime is 1617621431. The next prime is 1617621461. The reversal of 1617621451 is 1541267161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1541267161 = 7 ⋅220181023.

It is not a de Polignac number, because 1617621451 - 2¹⁵ = 1617588683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1617621431) 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, 47577085 + ... + 47577118.

It is an arithmetic number, because the mean of its divisors is an integer number (428193918).

Almost surely, 2^1617621451 is an apocalyptic number.

1617621451 is a deficient number, since it is larger than the sum of its proper divisors (95154221).

1617621451 is an equidigital number, since it uses as much as digits as its factorization.

1617621451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95154220.

The product of its digits is 10080, while the sum is 34.

The square root of 1617621451 is about 40219.6649787141. The cubic root of 1617621451 is about 1173.8852142330.

The spelling of 1617621451 in words is "one billion, six hundred seventeen million, six hundred twenty-one thousand, four hundred fifty-one".