99981451 has 2 divisors, whose sum is σ = 99981452. Its totient is φ = 99981450.

The previous prime is 99981421. The next prime is 99981467. The reversal of 99981451 is 15418999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99981451 - 2¹³ = 99973259 is a prime.

It is not a weakly prime, because it can be changed into another prime (99981421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49990725 + 49990726.

It is an arithmetic number, because the mean of its divisors is an integer number (49990726).

Almost surely, 2^99981451 is an apocalyptic number.

99981451 is a deficient number, since it is larger than the sum of its proper divisors (1).

99981451 is an equidigital number, since it uses as much as digits as its factorization.

99981451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 46.

The square root of 99981451 is about 9999.0725069878. The cubic root of 99981451 is about 464.1301826429.

It can be divided in two parts, 9998 and 1451, that added together give a square (11449 = 107²).

The spelling of 99981451 in words is "ninety-nine million, nine hundred eighty-one thousand, four hundred fifty-one".