994139551 has 4 divisors (see below), whose sum is σ = 996619104. Its totient is φ = 991660000.

The previous prime is 994139539. The next prime is 994139561. The reversal of 994139551 is 155931499.

It is a happy number.

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 994139551 - 2⁵ = 994139519 is a prime.

It is a super-3 number, since 3×994139551³ (a number of 28 digits) contains 333 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 (994139521) 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, 1239175 + ... + 1239976.

It is an arithmetic number, because the mean of its divisors is an integer number (249154776).

Almost surely, 2^994139551 is an apocalyptic number.

994139551 is a deficient number, since it is larger than the sum of its proper divisors (2479553).

994139551 is a wasteful number, since it uses less digits than its factorization.

994139551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479552.

The product of its digits is 218700, while the sum is 46.

The square root of 994139551 is about 31529.9786076680. The cubic root of 994139551 is about 998.0426884310.

The spelling of 994139551 in words is "nine hundred ninety-four million, one hundred thirty-nine thousand, five hundred fifty-one".