5401661242 has 4 divisors (see below), whose sum is σ = 8102491866. Its totient is φ = 2700830620.

The previous prime is 5401661233. The next prime is 5401661257. The reversal of 5401661242 is 2421661045.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 3862746801 + 1538914441 = 62151^2 + 39229^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1350415309 + ... + 1350415312.

Almost surely, 2^5401661242 is an apocalyptic number.

5401661242 is a deficient number, since it is larger than the sum of its proper divisors (2700830624).

5401661242 is a wasteful number, since it uses less digits than its factorization.

5401661242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700830623.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 5401661242 is about 73495.9947344071. The cubic root of 5401661242 is about 1754.5905319294.

The spelling of 5401661242 in words is "five billion, four hundred one million, six hundred sixty-one thousand, two hundred forty-two".