2451155981 has 2 divisors, whose sum is σ = 2451155982. Its totient is φ = 2451155980.

The previous prime is 2451155963. The next prime is 2451156041. The reversal of 2451155981 is 1895511542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2425562500 + 25593481 = 49250^2 + 5059^2 .

It is a cyclic number.

It is not a de Polignac number, because 2451155981 - 2¹⁰ = 2451154957 is a prime.

It is a super-2 number, since 2×2451155981² = 12016331286384144722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2451155911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1225577990 + 1225577991.

It is an arithmetic number, because the mean of its divisors is an integer number (1225577991).

Almost surely, 2^2451155981 is an apocalyptic number.

It is an amenable number.

2451155981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2451155981 is an equidigital number, since it uses as much as digits as its factorization.

2451155981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 41.

The square root of 2451155981 is about 49509.1504774622. The cubic root of 2451155981 is about 1348.3117407267.

The spelling of 2451155981 in words is "two billion, four hundred fifty-one million, one hundred fifty-five thousand, nine hundred eighty-one".