42991101 has 8 divisors (see below), whose sum is σ = 63690560. Its totient is φ = 28660716.

The previous prime is 42991097. The next prime is 42991121. The reversal of 42991101 is 10119924.

It is not a de Polignac number, because 42991101 - 2² = 42991097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1592263 = 42991101 / (4 + 2 + 9 + 9 + 1 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42991121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796105 + ... + 796158.

It is an arithmetic number, because the mean of its divisors is an integer number (7961320).

Almost surely, 2^42991101 is an apocalyptic number.

It is an amenable number.

42991101 is a deficient number, since it is larger than the sum of its proper divisors (20699459).

42991101 is a wasteful number, since it uses less digits than its factorization.

42991101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592272 (or 1592266 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 42991101 is about 6556.7599468030. The cubic root of 42991101 is about 350.3156363563.

The spelling of 42991101 in words is "forty-two million, nine hundred ninety-one thousand, one hundred one".