1972511641 has 4 divisors (see below), whose sum is σ = 1985574784. Its totient is φ = 1959448500.

The previous prime is 1972511627. The next prime is 1972511669. The reversal of 1972511641 is 1461152791.

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.

It is a cyclic number.

It is not a de Polignac number, because 1972511641 - 2¹¹ = 1972509593 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 1972511641.

It is not an unprimeable number, because it can be changed into a prime (1972511141) 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, 6531345 + ... + 6531646.

It is an arithmetic number, because the mean of its divisors is an integer number (496393696).

Almost surely, 2^1972511641 is an apocalyptic number.

It is an amenable number.

1972511641 is a deficient number, since it is larger than the sum of its proper divisors (13063143).

1972511641 is a wasteful number, since it uses less digits than its factorization.

1972511641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13063142.

The product of its digits is 15120, while the sum is 37.

The square root of 1972511641 is about 44412.9670366662. The cubic root of 1972511641 is about 1254.1222077261.

The spelling of 1972511641 in words is "one billion, nine hundred seventy-two million, five hundred eleven thousand, six hundred forty-one".