1975654549 has 4 divisors (see below), whose sum is σ = 2155259520. Its totient is φ = 1796049580.

The previous prime is 1975654537. The next prime is 1975654607. The reversal of 1975654549 is 9454565791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9454565791 = 11 ⋅859505981.

It is a cyclic number.

It is not a de Polignac number, because 1975654549 - 2¹³ = 1975646357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1975654549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1975664549) 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, 89802469 + ... + 89802490.

It is an arithmetic number, because the mean of its divisors is an integer number (538814880).

Almost surely, 2^1975654549 is an apocalyptic number.

It is an amenable number.

1975654549 is a deficient number, since it is larger than the sum of its proper divisors (179604971).

1975654549 is a wasteful number, since it uses less digits than its factorization.

1975654549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179604970.

The product of its digits is 6804000, while the sum is 55.

The square root of 1975654549 is about 44448.3357281237. The cubic root of 1975654549 is about 1254.7879408689.

It can be divided in two parts, 19756 and 54549, that added together give a triangular number (74305 = T₃₈₅).

The spelling of 1975654549 in words is "one billion, nine hundred seventy-five million, six hundred fifty-four thousand, five hundred forty-nine".