981432451 has 4 divisors (see below), whose sum is σ = 981515304. Its totient is φ = 981349600.

The previous prime is 981432449. The next prime is 981432469. The reversal of 981432451 is 154234189.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 154234189 = 137 ⋅1125797.

It is a cyclic number.

It is not a de Polignac number, because 981432451 - 2¹ = 981432449 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 981432451.

It is not an unprimeable number, because it can be changed into a prime (981436451) 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, 19945 + ... + 48586.

It is an arithmetic number, because the mean of its divisors is an integer number (245378826).

Almost surely, 2^981432451 is an apocalyptic number.

981432451 is a deficient number, since it is larger than the sum of its proper divisors (82853).

981432451 is a wasteful number, since it uses less digits than its factorization.

981432451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82852.

The product of its digits is 34560, while the sum is 37.

The square root of 981432451 is about 31327.8223149966. The cubic root of 981432451 is about 993.7721109171.

The spelling of 981432451 in words is "nine hundred eighty-one million, four hundred thirty-two thousand, four hundred fifty-one".