91981234 has 4 divisors (see below), whose sum is σ = 137971854. Its totient is φ = 45990616.

The previous prime is 91981231. The next prime is 91981249. The reversal of 91981234 is 43218919.

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

It can be written as a sum of positive squares in only one way, i.e., 75603025 + 16378209 = 8695^2 + 4047^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91981193 and 91981202.

It is not an unprimeable number, because it can be changed into a prime (91981231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22995307 + ... + 22995310.

Almost surely, 2^91981234 is an apocalyptic number.

91981234 is a deficient number, since it is larger than the sum of its proper divisors (45990620).

91981234 is a wasteful number, since it uses less digits than its factorization.

91981234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45990619.

The product of its digits is 15552, while the sum is 37.

The square root of 91981234 is about 9590.6847513616. The cubic root of 91981234 is about 451.4050471009.

The spelling of 91981234 in words is "ninety-one million, nine hundred eighty-one thousand, two hundred thirty-four".