84621031 has 4 divisors (see below), whose sum is σ = 92313864. Its totient is φ = 76928200.

The previous prime is 84621023. The next prime is 84621059. The reversal of 84621031 is 13012648.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84621031 - 2³ = 84621023 is a prime.

It is a super-2 number, since 2×84621031² = 14321437775005922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84620987 and 84621005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84621431) 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, 3846400 + ... + 3846421.

It is an arithmetic number, because the mean of its divisors is an integer number (23078466).

Almost surely, 2^84621031 is an apocalyptic number.

84621031 is a deficient number, since it is larger than the sum of its proper divisors (7692833).

84621031 is a wasteful number, since it uses less digits than its factorization.

84621031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692832.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 84621031 is about 9198.9690183194. The cubic root of 84621031 is about 439.0285575623.

Adding to 84621031 its reverse (13012648), we get a palindrome (97633679).

The spelling of 84621031 in words is "eighty-four million, six hundred twenty-one thousand, thirty-one".