1611878401 has 8 divisors (see below), whose sum is σ = 1843128000. Its totient is φ = 1380874128.

The previous prime is 1611878381. The next prime is 1611878413. The reversal of 1611878401 is 1048781161.

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 1611878401 - 2⁵ = 1611878369 is a prime.

It is a super-2 number, since 2×1611878401² = 5196303959220633602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1611878441) 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, 47026 + ... + 73723.

It is an arithmetic number, because the mean of its divisors is an integer number (230391000).

Almost surely, 2^1611878401 is an apocalyptic number.

It is an amenable number.

1611878401 is a deficient number, since it is larger than the sum of its proper divisors (231249599).

1611878401 is a wasteful number, since it uses less digits than its factorization.

1611878401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122663.

The product of its (nonzero) digits is 10752, while the sum is 37.

The square root of 1611878401 is about 40148.2054518007. The cubic root of 1611878401 is about 1172.4943499712.

The spelling of 1611878401 in words is "one billion, six hundred eleven million, eight hundred seventy-eight thousand, four hundred one".