81210967 has 16 divisors (see below), whose sum is σ = 85642272. Its totient is φ = 76930560.

The previous prime is 81210923. The next prime is 81210977. The reversal of 81210967 is 76901218.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81210967 - 2¹⁹ = 80686679 is a prime.

It is a super-2 number, since 2×81210967² = 13190442322150178, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81210977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288867 + ... + 289147.

It is an arithmetic number, because the mean of its divisors is an integer number (5352642).

Almost surely, 2^81210967 is an apocalyptic number.

81210967 is a deficient number, since it is larger than the sum of its proper divisors (4431305).

81210967 is a wasteful number, since it uses less digits than its factorization.

81210967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 81210967 is about 9011.7127672824. The cubic root of 81210967 is about 433.0501837947.

The spelling of 81210967 in words is "eighty-one million, two hundred ten thousand, nine hundred sixty-seven".