55139701 has 4 divisors (see below), whose sum is σ = 57041100. Its totient is φ = 53238304.

The previous prime is 55139681. The next prime is 55139719. The reversal of 55139701 is 10793155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10793155 = 5 ⋅2158631.

It can be written as a sum of positive squares in 2 ways, for example, as 21150801 + 33988900 = 4599^2 + 5830^2 .

It is a cyclic number.

It is not a de Polignac number, because 55139701 - 2¹³ = 55131509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55139741) 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, 950656 + ... + 950713.

It is an arithmetic number, because the mean of its divisors is an integer number (14260275).

Almost surely, 2^55139701 is an apocalyptic number.

It is an amenable number.

55139701 is a deficient number, since it is larger than the sum of its proper divisors (1901399).

55139701 is a wasteful number, since it uses less digits than its factorization.

55139701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901398.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 55139701 is about 7425.6111532991. The cubic root of 55139701 is about 380.6169594569.

The spelling of 55139701 in words is "fifty-five million, one hundred thirty-nine thousand, seven hundred one".