1981053501 has 16 divisors (see below), whose sum is σ = 3028591104. Its totient is φ = 1128339504.

The previous prime is 1981053461. The next prime is 1981053541. The reversal of 1981053501 is 1053501891.

It is an interprime number because it is at equal distance from previous prime (1981053461) and next prime (1981053541).

It is a de Polignac number, because none of the positive numbers 2^k-1981053501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981053541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147195 + ... + 160088.

It is an arithmetic number, because the mean of its divisors is an integer number (189286944).

Almost surely, 2^1981053501 is an apocalyptic number.

It is an amenable number.

1981053501 is a deficient number, since it is larger than the sum of its proper divisors (1047537603).

1981053501 is a wasteful number, since it uses less digits than its factorization.

1981053501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307600.

The product of its (nonzero) digits is 5400, while the sum is 33.

The square root of 1981053501 is about 44509.0271855047. The cubic root of 1981053501 is about 1255.9299047136.

The spelling of 1981053501 in words is "one billion, nine hundred eighty-one million, fifty-three thousand, five hundred one".