49142509 has 4 divisors (see below), whose sum is σ = 52922716. Its totient is φ = 45362304.

The previous prime is 49142491. The next prime is 49142539. The reversal of 49142509 is 90524194.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29975625 + 19166884 = 5475^2 + 4378^2 .

It is a de Polignac number, because none of the positive numbers 2^k-49142509 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 (49142539) 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, 1890084 + ... + 1890109.

It is an arithmetic number, because the mean of its divisors is an integer number (13230679).

Almost surely, 2^49142509 is an apocalyptic number.

It is an amenable number.

49142509 is a deficient number, since it is larger than the sum of its proper divisors (3780207).

49142509 is a wasteful number, since it uses less digits than its factorization.

49142509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780206.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 49142509 is about 7010.1718238571. The cubic root of 49142509 is about 366.2849786625.

The spelling of 49142509 in words is "forty-nine million, one hundred forty-two thousand, five hundred nine".