1451323981 has 2 divisors, whose sum is σ = 1451323982. Its totient is φ = 1451323980.

The previous prime is 1451323961. The next prime is 1451324009. The reversal of 1451323981 is 1893231541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 922093956 + 529230025 = 30366^2 + 23005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1451323981 is a prime.

It is a super-2 number, since 2×1451323981² = 4212682595651376722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1451323981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1451323961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 725661990 + 725661991.

It is an arithmetic number, because the mean of its divisors is an integer number (725661991).

Almost surely, 2^1451323981 is an apocalyptic number.

It is an amenable number.

1451323981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1451323981 is an equidigital number, since it uses as much as digits as its factorization.

1451323981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 1451323981 is about 38096.2462849032. The cubic root of 1451323981 is about 1132.1955852976.

The spelling of 1451323981 in words is "one billion, four hundred fifty-one million, three hundred twenty-three thousand, nine hundred eighty-one".