819157641 has 16 divisors (see below), whose sum is σ = 1101355776. Its totient is φ = 541547856.

The previous prime is 819157639. The next prime is 819157643. The reversal of 819157641 is 146751918.

It is an interprime number because it is at equal distance from previous prime (819157639) and next prime (819157643).

It is not a de Polignac number, because 819157641 - 2¹ = 819157639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 819157593 and 819157602.

It is not an unprimeable number, because it can be changed into a prime (819157643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254146 + ... + 257348.

It is an arithmetic number, because the mean of its divisors is an integer number (68834736).

Almost surely, 2^819157641 is an apocalyptic number.

It is an amenable number.

819157641 is a deficient number, since it is larger than the sum of its proper divisors (282198135).

819157641 is a wasteful number, since it uses less digits than its factorization.

819157641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3892.

The product of its digits is 60480, while the sum is 42.

The square root of 819157641 is about 28620.9301211543. The cubic root of 819157641 is about 935.6695485455.

The spelling of 819157641 in words is "eight hundred nineteen million, one hundred fifty-seven thousand, six hundred forty-one".